Question

A. Tick the correct option.

1) Name the small particles of which matter is said to be composed of:
a) Electrons
b) protons
C) neutrons
d) atoms

2 What is an element having three valency 3 called?
a) divalent
b) monovalent
c) trivalent
d) pentavalent

3What is the combining capacity of an element called?
a) symbol
b) valency
c.) radical
d.) none of these

4 Which of these form basic oxides?
a) C
b) N
C) Na
d) O

5 .The insoluble substance formed during a )chemical reaction is called
a.) reactant b. effervescence c. precipitate d.) none of these​

Answer 1

Answer:

1-a 2-your wrong it is scandium 3-

Answer 2

Answer:

D Atoms

D. Pentavalent

3. None of these

4. Na

5. Precipitate