Atomic Structure

1) Zinc, with 30 protons, 30 electrons, and 35 neutrons is atomic number

1. 30
2. 35
3. 60
4. 65

2) The maximum number of electrons that could fit in the "p" sublevel is

1. 9
2. 6
3. 3
4. 2

3) Element number 13 has ____ valence electrons.

1. 13
2. 10
3. 8
4. 3

4) Starting with 1 kg of a radioactive substance, after four half-lives, there will be approximately ____ grams left.

1. 63
2. 125
3. 250
4. 500

5) Which of the following types of radiation will be stopped by a piece of paper?

1. alpha
2. neutron
3. Gamma ray
4. x-ray

6) Which principal energy level of an atom contains an electron with the lowest energy?

1. n = 1
2. n = 2
3. n = 3
4. n = 4

7) An alpha particle has the same composition as a

1. hydrogen nucleus
2. deuterium nucleus
3. beryllium nucleus
4. helium nucleus

8) What is the nuclear charge of an atom with a mass of 23 and an atomic number of 11?

1. 11 +
2. 12 +
3. 23 +
4. 34 +

9) As a radioactive element emits gamma radiation only, the atomic number of the element

1. decreases
2. increases
3. remains the same

10) A neutral atom in the ground state contains 16 electrons. What is the total number of electron in the 2p sublevel?

1. 6
2. 2
3. 8
4. 16