Chemistry S1 Review

Front

What is the symbol for an alpha particle?

Back

\( \text{ }^{4}_{2}\text{He} \)

Front

What is the mass number in the symbol \( \text{ }^{206}_{82}\text{Pb} \)?

Back

Mass number is 206.

Front

If an element gains 1 electron, what charge will it have?

Back

-1

Front

What is the symbol for Potassium?

Back

K

Front

What is the atomic number of an element?

Back

The number of protons in the nucleus of an atom.

Front

What is the difference between atomic mass and mass number?

Back

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

Front

What is a neutron?

Back

A subatomic particle with no charge found in the nucleus of an atom.

Front

What is the charge of a proton?

Back

+1

Front

What is the formula for calculating the number of neutrons in an atom?

Back

Number of neutrons = Mass number - Atomic number.

Front

What is the significance of the periodic table?

Back

It organizes elements based on their atomic number and properties.