Valence Electrons

Q.

What is penultimate shells and antipenultimate shells?

Q. How to find the valency of a polyatomic ion??

Q.

State the valency of bromide ion.

Q.

The valency of chloride ion is___ .

Q.

Why is the valency of hydrogen positive?

Q.

Name the following

A reddish-brown coloured metal

Q.

Iron exhibits the valency of

1. ${}^{+}1$

2. ${}^{+}2$

3. ${}^{+}3$

4. ${}^{+}2$ and ${}^{+}3$

Q.

The atom of an element has 20 protons, 20 electrons and 20 neutrons:

Write the electronic configuration of the element.

Q. Number of valence electrons in Cl− ion is ___

Q. The electronic configuration of element chlorine is:​

1. 2, 8, 1
2. 2, 4 , 8
3. 2, 8, 7
4. 2, 4 , 8

Q.

4(b) Name the kind of valency belonging to metals. Give proper reasons.

Q.

What is the valency of Aluminium?

1. 2

2. 4

3. 8

4. 3

Q. Stability is achieved when there are _______ electrons in the outermost shell.

1. 8

Q. Which of the following does not represents a polyatomic ion?

1. Sulphite
2. Chloride
3. Sulphate
4. Phosphate

Q.

What is the valency of (OH) ion

Q. The innermost shell is called the valence shell.

1. False
2. True

Q. The number of valence electrons in an oxygen atom is 2.

1. True
2. False

Q. Elements with a valency 1 are -

1. Always non-metals
2. Either metals or non-metals
3. Always metals
4. Always metalloids

Q. The dot on top of H represents the valence electron of hydrogen.

1. False
2. True

Q. Which of the following is the incorrect set of atomic number and valency?

1. Sodium: atomic number-11, valency-1
2. Nitrogen: atomic number-7, valency-1
3. Magnesium: atomic number-12, valency-2
4. Carbon: atomic number-6, valency-4

Q. $C^{4-}$ is unstable because it would be very difficult for 6 protons to hold 10 electrons.

1. True
2. False

Q. Which of the following are polyatomic ions?

1. Ammonium
2. Hydride
3. Oxide
4. Hydroxide