Atoms... So Far

Front

What are isotopes?

Back

Isotopes are variants of a chemical element that have the same number of protons but different numbers of neutrons.

Front

What is the atomic model proposed by Dalton?

Back

Dalton's atomic model states that all matter is made up of indivisible atoms, which are the smallest units of an element.

Front

What are protons?

Back

Protons are subatomic particles found in the nucleus of an atom that have a positive charge.

Front

How many protons does an atom with an atomic number of 15 have?

Back

An atom with an atomic number of 15 has 15 protons.

Front

What is a cation?

Back

A cation is a positively charged ion, formed when an atom loses one or more electrons.

Front

What is an anion?

Back

An anion is a negatively charged ion, formed when an atom gains one or more electrons.

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

What is the difference between atomic number and mass number?

Back

The atomic number is the number of protons in an atom, while the mass number is the sum of protons and neutrons.

Front

What is the charge of neutrons?

Back

Neutrons have no charge; they are neutral particles found in the nucleus of an atom.

Front

Who discovered the electron?

Back

J.J. Thomson discovered the electron in 1897.