science 4th p 4321

if an ion has a (+) symbol, lost or gained

• gained electron

• lost electrons

what symbols are used for ions

• • + and -

• -

• +

• Yi

what is an atom

• smallest unit of matter

• smallest unit of life

• smallest unit of DNA

• smallest unit of life

what is TRUE FACT about ions

• different number of electrons

• different number of protons

how is an ion formed

• when atom does not have the same

  number of electrons

• when protons and electrons are mixed together

A neutral magnesium (Mg) atom has 12 protons and

12 electrons. If the magnesium atom loses 2

electrons, it will have a net electrical charge of

• 2-

• 5-

• 3-

• 9-

A magnesium ion is represented as

• Mg-2

• Mi-2

• Ga-4

• Fe-4

Sodium (Na) atoms have _+11_ protons and

_11-_electrons with a net charge of

• 0

• 1

• 2

• 4

Whats the mass,proton,and the neutron

• 31,70,39

• 31,69,39

The atomic number for Sb is 51.What is Sb-123

• 51

• 53

• 52

• 174