level 4

How many neutrons does the isotope of lithium have?

• 5

• 2

• 8

Two atoms of the same element but with different mass numbers are called________

• isotopes

• electrons

• electron cloud

An atom has 5 neutrons and a mass number of 9. How many protons does it have?

• 2

• 4

• 5

How many protons does this isotope of titanium have?

• 22

• 48

• 50

which atom has 4 neutrons?

• Li -7

• Li-6

• Li-8

Ions are:

• atoms with a positive or negative charge

• atoms with ONLY a positive charge

• atoms with no charge

This is the force of attraction that holds atoms together

• chemical bond

• force of the universe