Which pair of elements will join to form a compound with one to one ratio:
a) Magnesium and Chlorine
b) Sodium and Oxygen
c) Potassium and Fluorine
d) Lithium and Sulphur
When calcium atom become a Calcium ion(Ca+2):
a) it loses an electron
b) it loses two electron
c) it gains electron
d) gains two electrons
Which two elements will form a covalent compound:
a) Sodium and Oxygen
b) Copper and Oxygen
c) Carbon and Oxygen
d) Magnesium and Oxygen
In the formation of an ionic bond, the atoms taking part:
a) only gain electrons
b) share electrons
c) lose and gain of electrons
d) only lose electrons
Fluorine has an electronic confugration 2, 7 and Oxygen 2, 6. The formula of fluorine oxide will be:
a) FO
b) F2O
c) FO2
d) F2O2
Which of these statements about covalent bonds is incorrect:
a) HCl contains one pair of shared electron
b) CCl4 contains four pairs of shared electrons
c) H2O contains three pairs of shared electrons
d) NH3 contains three pairs of shared electrons
