Unit 1: Atomic Structure and history

Front

What is the mass number of an element?

Back

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

Front

How do you calculate the mass number of an element with 18 protons and 19 neutrons?

Back

Mass number = Protons + Neutrons = 18 + 19 = 37.

Front

What is the number of neutrons in Chlorine with a mass number of 35?

Back

Chlorine has 17 protons, so Neutrons = Mass number - Protons = 35 - 17 = 18.

Front

How many electrons does a neutral sulfur atom have?

Back

A neutral sulfur atom has 16 electrons, equal to its number of protons.

Front

What is matter?

Back

Matter is anything that has mass and takes up space.

Front

What are electrons?

Back

Electrons are subatomic particles that have a negative charge.

Front

What are protons?

Back

Protons are positively charged subatomic particles found in the nucleus of an atom.

Front

What are neutrons?

Back

Neutrons are neutral subatomic particles found in the nucleus of an atom.

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 the difference between mass number and atomic number?

Back

Mass number is the sum of protons and neutrons, while atomic number is the number of protons.