Atomic Structure and Isotopes

Front

What is the atomic number of an atom?

Back

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

Front

How many protons does an atom with atomic number 6 have?

Back

6 protons.

Front

What is matter made of?

Back

All matter is made of atoms.

Front

Which two components of an atom contribute to its mass?

Back

Protons and neutrons.

Front

What is the mass of an electron?

Back

The mass of an electron is negligible.

Front

How many electrons does an uncharged atom of Lithium (Li) have?

Back

3 electrons.

Front

What are isotopes?

Back

Isotopes are atoms of the same element that have the same number of protons but different numbers of neutrons.

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 charge of a proton?

Back

A proton has a positive charge.