chemistry EOT T3 grade 10E

If the number of electrons (e-) in phosphorus (P) is 15, what are the number of valence electrons?

• 2

• 8

• 5

• 4

In the periodic table, valence electrons are indicated by:

• group number

• shell number

• period number

• atomic mass

Anions have a

• negative charge

• positive charge

Cations have a

• negative charge

• positive charge

An ion is formed when an atom of a representative element

• gains or loses protons

• shares electrons to achieve stability

• loses or gains electrons to satisfy the octet rule

• all of the above is correct

Aluminum forms an ion with a charge of

• +2

• -1

• +3

• -2

like charges

• repel

• attract

un-like charges

• repel

• attract

Atoms of the representative elements have a tendency to seek stability through

• acquiring the noble gas structure

• filling or emptying their outer orbitals

• any situation that will satisfy the octet rule

• all of the above

The electrons that participate in chemical bonding are the

• valence electrons

• electrons in fully occupied orbitals

• stable inner electrons

• all of the above