Atoms and Periodic Table
Which named group does an element with an electron configuration of [Kr]5s24d7 belong to?
Transition metals
How many electrons can have the quantum numbers n = 2 and l = 2?
0
What is the oxidation state of P in H3PO4?
+5
How many moles of nitrogen are in 3 moles of (NH4)2SO3?
6
HCl
hydrochloric acid
Consider the set of isoelectronic atoms and ions A, B2-, C+, D-, and E2+. What is the correct arrangement of relative radii?
B2- > D- > A > C+ > E2+
How many electrons can have l = 3 and ml = +1?
2
How many d electrons does Cu2+ have?
9
How many sodium ions are needed to make a neutral ionic compound with one sulfate ion?
2
hydrocyanic acid
HCN
How many electrons are in a fictional element 9241Z2+?
39
Which of the following electronic transitions could lead to the emission of light from an atom?
1s -A-> 4p -B-> 3d -C-> 5s -D-> 4d -E-> 2p
B, E
Which of the following atoms or ions, Al, O, Ca, C, Zn2+, Co, has 3 unpaired electrons in its ground state electron configuration?
Co
Sorbose, C6H12O6, is used in the making of vitamin C. A sorbose sample containing 36.0 g of carbon atoms also contains how many grams of hydrogen atoms?
6.04
C7H16
heptane
Which of these elements - Ge, Sb, Sn, Se, Te, As - has the highest first ionization energy?
As
How many electrons can have n = 3 and l = 2?
10
Which of the following sets is an isoelectronic series?
1) F, Ne, Na
2) P3-, S2-, Ar-
3) Cl, Ar, K
4) F-, Ne, Na+
4) F-, Ne, Na+
You have a 52.6 g sample of compound X2O7 that contains 32.2 g of oxygen atoms. What is the molecular weight of X?
35.5 g/mol
ammonia
NH3
Naturally occurring copper is comprised of two isotopes: 63Cu has an atomic mass of 62.9396 g/mole, and 65Cu has an atomic mass of 64.9278 g/mole. If the average molecular mass is 64.546 g/mole, what are the percent abundances of each isotope?
63Cu:19.20%
65Cu: 80.80%
What is the maximum number of electrons that can fit into the fourth shell?
32
What is the electron configuration diagram for oxygen?
1s: _↑↓_ 2s: _↑↓_ 2p: _↑↓_ _↑_ _↑_
You have a compound that is 85.62% C and 14.38% H. If its molecular mass is 56.06 g/mole, what is its molecular formula?
C4H8
CuSO4 · 5H2O
copper(II) sulfate pentahydrate