Valency

Q.

what is valency

Q.

What are the limitations of Octet Rule?

Q.

How will you find the valency of chlorine($\mathrm{Cl}$), sulphur($\mathrm{S}$) and magnesium($\mathrm{Mg}$)?

Q. Elements with a valency 1 are -

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

Q. An atom with 3 protons and 4 neutrons have a valency of ___.

Q.

Write the chemical formula of hydrogen sulphide.

Q.

What is the valency of sulphur?

Q.

How many valence electrons are in an atom of phosphorus?

Q. XCl2 is the chloride of a metal X. State the formula of its hydroxide and sulphate

Q.

How are the element that exhibit variable valency named? Explain in detail.

Q.

What are the valence electrons of titanium?

Q.

If Z = 3, what would be the valency of the element? Also, name the element.

Q.

What is the valency of iron in ferrous sulphate?

Q.

The valency of carbon is 4 and that of oxygen is 2. What is the molecular formula of carbon dioxide?

1. CO

2. C₂O

3. C₂O₂

4. CO₂

Q. Sodium (Na) has 11 electrons in its atom. Its electronic configuration is:

1. Na (1, 2, 8)
2. Na (2, 9)
3. Na (2, 5, 4)
4. Na (2, 8, 1)

Q.

What is the number of the valence electrons in Sodium ion $\left({\mathrm{Na}}^{+}\right)$ ?

Q.

Write the valency of calcium.

Q. How many electrons are there in an atom of lithium?

1. 2
2. 3
3. 8
4. 4

Q.

The valency of iron in ${\mathrm{Fe}}_2{\mathrm{O}}_3$ is

1. $1$

2. $2$

3. $3$

4. $6$

Q.

The valency of aluminium is 3. Write the valency of their radicals present in the following compounds.

(a) Aluminium chloride

(b) Aluminium oxide

(c) Aluminium nitride

(d) Aluminium sulphate

Q. Chlorine has seven electrons in its outermost shell. Valency of chlorine is .

1. 7
2. 1
3. \N

Q.

Phosphorus has electronic configuration of 2, 8, 5

Which period the element Phosphorus belong to?

1. 1st period

2. 3rd period

3. 2nd period

4. 5th period

Q.

What are the different types of valency?

Q. __ is defined as the combining capacity of an element.

Q.

Find the valency and valence electrons in Aluminium (Atomic number =13)

Q.

Write the chemical formula for:

Iron (III) carbonate

Q. Find out the number of valence electrons present in chlorine.

1. 5
2. 8
3. 7
4. 2

Q. What is the valency of an element with its electronic configuration 2, 8, 1?

1. 1
2. 2
3. 3
4. 4

Q. What is the valency of the group 18 elements in the modern periodic table?

1. 1
2. 2
3. 3
4. 0

Q.

Multiple Choice Questions

(a) The outermost shell of an atom is known as

(i) valency

(ii) valence electrons

(iii) nucleus

(iv) valence shell

(b) The number of valence electrons present in magnesium is

(i) two

(ii) three

(iii) four

(iv) five

(c) The sub atomic particle with positive charge is

(i) proton

(ii) neutron

(iii) electron

(iv) nucleon

(d) If the atomic number of an atom is 17 and mass number is 35 then number of neutrons will be

(i) 35

(ii) 17

(iii) 18

(iv) 52

(e) The number of electrons in an atom is equal to the number of

(i) protons in a neutral atom

(ii) neutrons in a neutral atom

(iii) nucleons in a neutral atom

(iv) none of the above

(f) The sum of number of protons and number of neutrons present in the nucleus of an atom is called its

(i) mass number

(ii) atomic number

(iii) number of electrons

(iv) all of the above