Chemistry: ChemQuest Skill Practice (Semester 1)

What is the charge on a magnesium ion that has 10 electrons?

+2

What is wrong with the following notation? 3f_____ ______ _______ ______ with an arrow pointing down in the first orbital.

1. The f orbital does not occur until the 4th energy level. 2. f sublevels have 7 orbitals and not 4.

What is the maximum number of electrons that fit in the 3d sublevel?

10e-

How many electrons can fit in a 2p orbital?

2e-

How many neutrons are there in a chromium atom with a mass number of 54?

30

Calcium has three different isotopes. One has a mass of 35 amu; another has a mass of 41 amu; and and another has a mass of 40 amu. Which isotope is the most abundant of the three?

40 amu Ca= 40.08

Write the notation for an electron spinning clockwise in the p sublevel in the 4th energy level.

4p____ _____ _____ with an arrow pointing up in the first orbital.

How many electrons can fit in the entire 5th energy level (s+p+d+f+g)

50e- total

Several isotopes of a certain atom "X" exist. 4.35% of all X atoms have a mass of 49.946 amu. 83.79% have a mass of 51.941, 9.50% have a mass of 52.941 amu, and 2.36% have a mass of 53.939 amu. What is the average atomic mass of atom X?

51.9963703 amu. This rounds to 52 amu.

How many sublevels would you expect in the 8th energy level?

8

Substance E has 29 protons, 28 electrons, and 34 neutrons. Substance F has 29 protons, 27 electrons, and 34 neutrons. Substance E and F can be categorized as... A. different elements. B. ions C. isotopes D. nuclides E. nucleons

B.

136 56 Ba+2 Find: Neutrons/Protons/Electrons/Atomic and Mass #/Charge

N-80 P-56 E-54 A-56 M-136

An element has 120 Neutrons, 79 electrons, and an atomic number of 79. Find: Element Name/Protons/Mass Number/Charge

Name-Au P-79 M-199

An element has 21 Neutrons, 20 Protons, and 18 electrons. Find: Element name/Atomic Number/Mass Number/Charge

Name-Ca A-20 M-41 Charge: +2

An element has 25 protons and 25 electrons, with a mass number of 56. Find: Element name/Neutrons/Atomic Number/Charge

Name-Mn N-31 A-25

What is an isotope? Give an example.

One of two or more atoms having the same number of protons but different numbers of neutrons. Ex. Carbon 13 and Carbon 14.

In the 5th energy level, there is a fifth sublevel called the "g sublevel". Considering the trend in number of orbitals and electrons in the s, p, d, and f sublevels, predict how many orbitals and how many electrons can fit in a g sublevel.

Orbitals: 9 Electrons: 9*2=18e-

The element with 38 protons and 45 neutrons could be correctly identified as which element?

Strontium

A certain ion has an atomic number of 16, a mass number of 33, and 18 electrons. a) What is the charge of the ion? b) What is the identity of this ion? c) How many neutrons does the nucleus of this ion have?

a) -2 b) Sulfur c) 17

Tritium (an isotope of hydrogen) has 2 neutrons. How many protons does it have? What is the mass number?

a) 1 b) 3

An atom has a mass number of 43 and it also has 21 electrons. a) How many protons does the atom have? b) What is the identity of the atom? c) How many neutrons does this atom have?

a) 21 b) Scandium c) 22

An element exists as 4 different isotopes. 4.35% have a mass of 49.9461, 83.79% have a mass of 51.9405, 9.50% have a mass of 52.9407 amu, and 2.36% have a mass of 53.9389 amu. a. What is the average atomic mass for this element? b. What is the identity of this element?

a. 51.99592484 amu. This rounds to 52 amu. b. Chromium (Cr)

A certain element exists as three different isotopes. 24.1% of all isotopes have a mass of 75.23 amu, 48.7% have a mass of 74.61 amu, and 27.2% have a mass of 75.20 amu. a. What is the average atomic mass of this element? b. Use your periodic table to determine what element this is.

a. 74.92 amu b. Arsenic (As)