Question

1. An element 'X' has six electrons in its outer or valence shell.
Its valency is
[+2/-2/-1]
2. An element 'Y' has electronic configuration 2, 8, 6.
The element Y is a
[metal/non-metal/noble gas].
3. A
(proton/neutron] is a sub-atomic particle with no charge and unit mass.
4. An element Z with zero valency is a [metal/noble gas/non-metal].
5. Magnesium atom with electronic configuration 2, 8, 2 achieves stable electronic
configuration by losing two electrons, thereby achieving stable electronic configuration of
the nearest noble gas
[neon/argon).​

Answer 1

Answer:

Q1. 2,

Q2. Non metal, ( Sulphur),

Q3. Neutron,

Q4. Noble Gas,

Q5. Neon.

Answer 2

Answer:

1. -2 2. non-metal 3. neutron 4. noble gas 5. neon

Explanation:

1. the element x will give 2 electrons to become stable. So its valency is -2.

2. non-metals are electron gainers.

4. noble gas are stable. So their valency is always zero.

5. neon has electronic configuration 2-8. Magnesium will lose two electrons and so its electronic configuration will also become 2-8