Atoms Test Review

Front

What is the symbol for an alpha particle in a nuclear equation?

Back

The symbol for an alpha particle is \( \text{ } ^4_2\text{He} \text{ } \).

Front

What does the atomic number represent in an element?

Back

The atomic number represents the number of protons in an element.

Front

How many protons does an element with an atomic number of 17 have?

Back

An element with an atomic number of 17 has 17 protons.

Front

How many neutrons are in the isotope of calcium with a mass number of 40?

Back

The isotope of calcium with a mass number of 40 has 20 neutrons.

Front

Which atomic model describes atoms as positive spheres with negative electrons?

Back

The Plum Pudding (or Chocolate Chip Cookie) Model describes atoms as positive spheres with negative electrons.

Front

What is the difference between atomic mass and mass number?

Back

Atomic mass is the weighted average mass of an element's isotopes, while mass number is the total number of protons and neutrons in an atom.

Front

What is the charge of a proton?

Back

The charge of a proton is +1.

Front

What is the charge of a neutron?

Back

The charge of a neutron is 0 (neutral).

Front

What is the charge of an electron?

Back

The charge of an electron is -1.

Front

How do you calculate the number of neutrons in an atom?

Back

To calculate the number of neutrons, subtract the atomic number from the mass number.