Answer: [tex]1s^22s^22p^63s^23p^64s^2[/tex] , oxidation state = +2
Explanation:
Electronic configuration represents the total number of electrons that a neutral element contains. We add all the superscripts to know the number of electrons in an atom. The electrons are filled according to Afbau's rule in order of increasing energies.
The electronic configuartion of Calcium with atomic number 20 is :
[tex]Ca:20:1s^22s^22p^63s^23p^64s^2[/tex]
As calcium can easily lose its two valence electrons to attain stability , its oxidation state is +2.
[tex]Ca^{2+}:18:1s^22s^22p^63s^23p^6[/tex]
How many significant figures are there in the measurement 0.0034 Kg?
Answer:
2 significant figures
Explanation:
Your measurement will have 2 significant figures, the two non-zero digits.
I hope this helps you out! :)
Answer:
there are 2 sig figs ( significant figures) which is 34. Zeros are not counted as significant figs in decimals like above
i) Mass of CO2 formed = 2.241 g Molar mass of CO2 = Atomic mass of C + 2 (Atomic mass of O) = 12 + 2 (16) g/mol = 44 g/mol Thus, moles of carbon dioxide formed
Answer:
0.05mole
Explanation:
Given parameters:
Mass of Carbon dioxide formed = 2.241g
Molar mass of Carbon dioxide = 44g/mol
Unknown:
Number of moles of carbon dioxide = ?
Solution:
To solve this problem, we use the expression below:
Number of moles = [tex]\frac{mass}{molar mass}[/tex]
Now, insert the parameters and solve;
Number of moles = [tex]\frac{2.241}{44}[/tex] = 0.05mole
Could really use some help with this!!! What are some chemical properties of nickel?
Answer:
Nickel is silvery-white, hard, malleable, and ductile metal.
It is a good conductor of heat and electricity.
It is bivalent, that is it has a valency of two.
The metal dissolves slowly in dilute acids.
Explanation:
Answer:
Atomic number: 28
Atomic mass: 58.71 g.mol
Melting point: 1453°C
Explanation:
I answered based off what i understood lol. I dunno if this is what you meant but here you go ig
If the boiling point of HCl is -85 (C) and the boiling point of Hl is -36 (C),
what would be a good estimate for the boiling point of HBr? *
What is the answer, and please make it fast.
if you want brainliest answer this pleaseeee
a bacterium has a length of 5.5 10-6 m but seen through a powerful microscope it appears to be 1.2 10-3 m. what is the magnification of the microscope?
a virtual image is produced by a convex mirror that is 1.60 cm from the mirror. if the magnification is 0.20 how far from the mirror is the object?
Answer:
what are the answer choices
Explanation:
Answer:
3x
Explanation:
!!Please help I will name u brainliest!! this is for 9th grade physical science
Answer:
a. no 2 7 4 6
b. yes
c. no 3 2 6 1
d. no 2 1 2
a. 1 2 2 1
b. 3 1 3 2
c. 1 5 2
d. 1 1 2
HELPPP
The sum of percentage compositions must equal to 100 ±0.1.
True
False
Answer:
True
Explanation:
explain in complete sentences how a convection current is created
Answer:
Convection currents are caused by the movement of the magma in the mantle.
Explanation:
Which pair of molecules have the same empirical formula?
Answer
A H2O and H604
B NaCrO4 and Na2Cr207
C K408 and K204
DC2H302 and C6H1206
what is the density of 80 gram of a substance occupying a volume of 250 c.m cube at 25°C and 1 atmosphere?
Answer:
Density = 0.32g/mL
Explanation:
Density of a substance can be calculated using the formula:
Density (g/mL) = mass (g)/volume (mL)
According to the information provided in this question, mass of the substance = 80grams, volume = 250cm³/mL
Note that, the pressure and temperature are not needed to calculate the density of the substance.
Density = 80/250
Density = 0.32g/mL
Which kind of bond is formed when two atoms share electorons to form a molecule
Answer:
Covalent bond is formed by mutual sharing of electrons between two atoms
Explanation:
A gram is one million times larger than a microgram but one billion times smaller than a _______________.
explain what happens differently to an electron to emit different colors of light
Which description lists Earth's layers from most superficial to deepest?
Lithosphere, asthenosphere, lower mantle, outer core, inner core
Lithosphere, lower mantle, asthenosphere, outer core, inner core
Asthenosphere, Lithosphere, lower mantle, inner core, outer core
Inner core, outer core, lower mantle, asthenosphere, lithosphere,
Answer:
Lithosphere, asthenosphere , lower mantle
Explanation:
took on edge 2021!
pt The crystal lattice structure of an ionic compound
A. is weak due to the interactions of the ion
B. is weak due to the independence of the ions
OC. is strong due to the interactions of the ions
D. is strong due to the independence of the ions
Answer:
D. is strong due to the independence of the ions
Explanation:
In an ionic solid, the ions are packed together into a repeating array called a crystal lattice.
The concept of crystal packing assumes that the ions are hard spheres. successive layers over it. The simplest arrangement is one in which the spheres in the base are packed side by side.The crystal lattice structure of an ionic compound is strong due to the interactions of the ions. Therefore, option (C) is correct.
What are ionic compounds?Ionic compounds can be defined as crystalline solids which are formed by closely packing ions of opposite charge due to the interactions of the ions. An Ionic compound is usually created when metal reacts with non-metal.
In ionic compounds, the ions are held together by ionic bonds due to the interactions of the ions. The ions are formed from atoms by gaining or losing electrons in order to attain their noble gas configuration.
A cation in ionic compounds refers to an electropositive ion and has the tendency to donate valence electrons. Similarly, anions in ionic compounds can be defined as electronegative ions and have a tendency to accept electrons.
In an ionic compound, there exists a large electrostatic force of attraction that forms a strong ionic bond.
Learn more about ionic compounds, here:
brainly.com/question/17217225
#SPJ2
How many electrons are in Na+
Answer:
10
Explanation:
10 ELECTRONS ARE IN
Na+
Which option correctly matches the chemical formula of a compound with its
name?
A. N2O5, nitrogen oxide
B. N204, nitrogen oxide
C. N205, dinitrogen pentoxide
D. N204, dinitrogen pentoxide
SUBT
Answer:
N205 dinitrogen pentoxide
Explanation:
Trust me miss gorl
Answer:
the answer above is correct.....
Explanation:
Write the balanced chemical equation for the combustion of sodium metal
Answer:
sodium appears as a silvery soft metal that becomes grayish white upon exposure to air
Explanation:
molecular weight 22.989769 g/mol
modify dates 2021 -01-23
create dates 2004-09-16
Can somebody plz help answer this question correctly!! (Only 1-2 sentences is good) thanks !!
WILL MARK BRAINLIEST WHOEVER ANSWERS FIRST :DDD
I believe the worst form of pollution is fissile fuels because coal takes millions of years to form and why burn something that takes so long to make.
You have 0.00891 g of platinum. What is this in micrograms?
A. 8.91 ug
B. 8910 ug
C. 8.91 x 10-6 ug
D. 8.91 x 10-9 ug
Answer:
Hope it help you
Stayhomestaysafe
Plz mark my answer brainliest✍️✍️
Explanation:
It would be 8910 ug
REAL NAME - SHRESTH DUBEY
The minimum amount of energy that particles must have in order to react is known as the... what?
What angle do parallel lines form when they intersect?
Answer:When two lines are cut by a transversal, the pairs of angles on one side of the transversal and inside the two lines are called the consecutive interior angles . If two parallel lines are cut by a transversal, then the pairs of consecutive interior angles formed are supplementary
Explanation:
How many moles of butane do we have if we have 5.50 x 1024 molecules
of butane (CH) ?
Answer:
9.14moles
Explanation:
Given parameters:
Number of atoms of butane = 5.5 x 10²⁴atoms
Unknown:
Number of moles = ?
Solution:
To solve this problem, we must understand that a mole of any substance contains the Avogadro's number of particles.
6.02 x 10²³ atoms makes up 1 mole of an atom
5.5 x 10²⁴ atoms will contain = [tex]\frac{5.5 x 10^{24} }{6.02 x 10^{23} }[/tex] = 9.14moles
This planet has a toxic atmosphere.
O Mercury
O Venus
O Earth
O Mars
the answer is venus.
Please help. I’m really struggling. No wrong answers please, if you don’t know it please don’t answer, I’m already failing the class.
Answer:
K₅Mn₅O₁₆
Explanation:
From the question given above, the following data were obtained:
Potassium (K) = 27.5 %
Manganese (Mn) = 37.5 %
Oxygen (O) = 35 %
Empirical formula =?
The empirical formula for the compound can be obtained as follow:
K = 27.5 %
Mn = 37.5 %
O = 35 %
Divide by their molar mass
K = 27.5 / 39 = 0.705
Mn = 37.5 / 55 = 0.682
O = 35 / 16 = 2.188
Divide by the smallest
K = 0.705 / 0.682 = 1
Mn = 0.682 / 0.682 = 1
O = 2.188 / 0.682 = 3.2 = 32/10 = 16/5
K = 1
Mn = 1
O = 16/5
Multiply by 5 to express in whole number
K = 1 × 5 = 5
Mn = 1 × 5 = 5
O = 16/5 × 5 =16
Thus, the empirical formula for the compound is K₅Mn₅O₁₆
i swear if someone helps me with this I’ll give them the biggest hug lol
Answer:
C
Explanation:
Bc Look at it like this if norm and grav are equal aka the reason why hes not going threw the cement or flying in the air then the app and the fric are equal too or he would slip and fall
How many formula units of magnesium hydroxide are found in 10.88 moles?
Answer:
10.88 moles of magnesium hydroxide contain 65.52 ×10²³formula units
Explanation:
Given data:
Number of formula units of magnesium hydroxide = ?
Number of moles = 10.88 mol
Solution:
The given problem will be solve by using Avogadro number.
The number 6.022×10²³ is called Avogadro number.
1 mole contain 6.022×10²³ formula units.
10.88 mol × 6.022×10²³formula units /1 mol
65.52 ×10²³formula units
Thus, 10.88 moles of magnesium hydroxide contain 65.52 ×10²³formula units .
What is the name of this molecular compound> F6I5 pleasee and thank youuuu!
Answer:
hexaflourine pentaiodide
Explanation:
f = flourine (6 = hexa)
i = iodine (5 = penta) + ide
Why is graphite used for electrodes?
Answer:
Graphite is an electrical conductor, hence useful in such applications as arc lamp electrodes. It can conduct electricity due to the vast electron delocalization within the carbon layers (a phenomenon called aromaticity). These valence electrons are free to move, so are able to conduct electricity.
Explanation:
Graphite is used for electrodes because
The atomic structure of graphite results in a large number of electrons not being bonded, allowing them to migrate between the layers of graphite. It is this large number of free electrons (electron delocalization) that give graphite its excellent conductive properties. As well as being a good conductor, graphite is also cheap, robust and easily accessible.