Question

FILL IN THE BLanks
1. The two classification of the mixtures are
&..
2 Dust in the air is an example of.
...mixture.
3. An example of a monoatomic molecule is
4 Valency of an element X is 3. Write the chemical formula of its oxide.
5. Write the electronic configuration of an element whose atomic number is 11.

8. The substances that react together in a chemical reaction are called
9 Magnesium +
Magnesium nitride.
TO. Plants and animals need
for their growth and functioning.
11. The boiling point of liquid nitrogen is
12
is a non-combustible gas but is a good supporter of combustion.
13. Matter has mass and occupies..
14. The change of a solid into liquid.
15. The change of vapour into a liquid
16. The gaseous state of a liquid is called.
is an alloy made from mixing copper and tin.
18
is also used electroplating metal articles to prevent corrosion.
19. Ferrous sulphate is used to treat
20. Magnesium is an essential element both in
and
21. Latin name of potassium is.
are fixed paths in which electrons move around the nucleus.​

Answer 1

Explanation:

5: sodium 1s2 2s2 2p6 3s1

21:kalium

Answer 2

Answer:

1. pure and impure

2. heterogeneous

3. neon

4.

$z \frac{}{2} o \frac{}{3}$

5. 2,8,1

8. reactants

11. -196 °C

12. oxygen

13. space

14.melting

15. condensation

16. vapour

19. Anemia

21. kalium

22. orbits ) shells