Atomic Structure

Front

Subatomic particles with a negative charge

Back

Electrons are subatomic particles that carry a negative charge and are found in the electron cloud surrounding the nucleus of an atom.

Front

What is the mass number of an atom?

Back

The mass number is the total number of protons and neutrons in an atom's nucleus.

Front

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

Back

Number of neutrons = Mass number - Atomic number.

Front

What is the atomic number of an element?

Back

The atomic number is the number of protons in the nucleus of an atom, which determines the element's identity.

Front

What is a neutral atom?

Back

A neutral atom has the same number of protons and electrons, resulting in no overall charge.

Front

What is an ion?

Back

An ion is an atom or molecule that has gained or lost one or more electrons, resulting in a net charge.

Front

What charge does an atom have if it has more electrons than protons?

Back

If an atom has more electrons than protons, it has a negative charge.

Front

What is the charge of an ion with 8 protons and 10 electrons?

Back

The ion has a negative charge of 2 (8 protons - 10 electrons = -2 charge).

Front

What is the mass number of an atom with 10 protons and 15 neutrons?

Back

The mass number is 25 (10 protons + 15 neutrons = 25).

Front

What is the relationship between protons and electrons in a neutral atom?

Back

In a neutral atom, the number of protons equals the number of electrons.