science

Front

How many isotopes of hydrogen are there?

Back

3

Front

What are isotopes?

Back

Same atomic number but different mass number.

Front

How many electrons are in the third shell (M)?

Back

18

Front

How many chambers does the heart have?

Back

4

Front

How many electrons are there in the second shell (L)?

Back

8

Front

What is the atomic number?

Back

The number of protons in the nucleus of an atom.

Front

What is the mass number?

Back

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

Front

What is an electron shell?

Back

A region around the nucleus where electrons are likely to be found.

Front

What is the function of the heart?

Back

To pump blood throughout the body.

Front

What is the difference between protons and neutrons?

Back

Protons are positively charged, while neutrons have no charge.