Periodic Table And Atomic Structure MCQ Questions and Answers for Practice

1. A carbon atom with 6 protons, 6 electrons, and 6 neutrons would have a mass number of

1. 18
2. 12
3. 15
4. 6

2. If an isotope of uranium, uranium-235, has 92 protons, how many protons does the isotope uranium-238 have?

1. 95
2. 143
3. 146
4. 92

3. The properties of elements in a horizontal row of the periodic table follow

1. a periodic pattern.
2. no pattern.
3. an unpredictable pattern.
4. a nonrepeating pattern.

4. The number at the top is the

1. element name.
2. atomic mass.
3. chemical symbol.
4. atomic number.

5. How would you describe the nucleus?

1. mostly empty space, positively charged
2. tiny, negatively charged
3. dense, negatively charged
4. dense, positively charged

6. The carbon group has two metalloids, both of which are used to make

1. foil.
2. cans.
3. computer chips.
4. dinnerware.

7. What is the meaning of the word atom?

1. invisible
2. hard particles
3. not able to be divided
4. dividable

8. Transition metals are

1. more reactive than alkali metals.
2. not good conductors of electric current.
3. used to make aluminum.
4. good conductors of thermal energy.

9. A horizontal row on the periodic table is called a(n)

1. family.
2. period.
3. atomic number.
4. group.

10. Where are electrons likely to be found?

1. in electron clouds
2. mixed throughout an atom
3. in definite paths
4. in the nucleus

11. Elements on the periodic table are arranged in order of

1. decreasing density.
2. increasing atomic number.
3. decreasing atomic number.
4. increasing density.

12. The elements to the right of the zigzag line on the periodic table are called

1. conductors.
2. metals.
3. nonmetals.
4. metalloids.

13. Elements lying along the zigzag line on a periodic table are

1. nonmetals
2. metalloids
3. noble gases
4. metals

14. Most of the elements in the periodic table are

1. metalloids.
2. gases.
3. nonmetals.
4. metals.

15. Which of the following has the least mass in an atom?

1. proton
2. neutron
3. electron
4. nucleus