atomic number and mass number

Front

What is the atomic number?

Back

The atomic number is the number of protons in the nucleus of an atom.

Front

What is the mass number?

Back

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

Front

How many electrons can the innermost energy level hold?

Back

The innermost energy level can hold a maximum of 2 electrons.

Front

What do isotopes of the same element have in common?

Back

Isotopes of the same element have the same atomic number but different mass numbers.

Front

What is the relationship between atomic number and protons?

Back

The atomic number is equal to the number of protons in an atom.

Front

What is the relationship between mass number and neutrons?

Back

Mass number = Number of protons + Number of neutrons.

Front

If an element has an atomic number of 6, how many protons does it have?

Back

It has 6 protons.

Front

If an element has a mass number of 12 and an atomic number of 6, how many neutrons does it have?

Back

It has 6 neutrons (12 - 6 = 6).

Front

What is the symbol for an element with atomic number 1?

Back

The symbol is H (Hydrogen).

Front

What is the significance of isotopes in chemistry?

Back

Isotopes are important for understanding nuclear reactions and applications in medicine and dating.