Science

A sub-atomic particle with no charge

• proton

• neutron

• electron

• nucleus

A sub-atomic particle with a postive charge

• proton

• neutron

• electron

• nucleus

A sub-atomic particle with a negative charge

• proton

• neutron

• electron

• nucleus

The region at the center of an atom that contains most of the atom's mass

• ion

• isotope

• nucleus

• electron cloud

The region surrounding the center of the atom that is mostly empty space

• ion

• isotope

• nucleus

• electron cloud

Atoms of the same element that have different numbers of neutrons

• ion

• isotope

• nucleus

• electron cloud

Atoms of the same element that have different numbers of electrons

• ion

• isotope

• nucleus

• electron cloud

Adding electrons to an atom makes a(n)

• positive ion

• isotope

• negative ion

• new element

Removing electrons from an atom makes a(n)

• positive ion

• isotope

• negative ion

• new element

The number of protons in an atom is its

• atomic mass

• atomic number

• element name

• element symbol