Valency

Q.

What is the valency of zinc?

Q. Atomic number of neon is 10. What is its valency?

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

Q.

How do you calculate the number of valence electrons in an arsenic atom?

Q.

What is the valency of boron?

Q.

How to find valency?

Q.

The formula of the compound is ${\mathrm{A}}_2{\mathrm{B}}_5$. The number of electrons in the outermost orbits of A and B respectively are?

Q.

Determine the valency of non-metal and va­lence electrons with examples.

Q. An element X forms an ion having a charge of $+4$ while another element Y forms an ion having a charge of $-2$. What will be the chemical formula of the compound formed by the combination of X and Y?

1. $X{Y}_2$
2. $XY$
3. $X_{2}Y$
4. $X{Y}_4$

Q.

Define valency.

Q.

There are 6 valence electrons in an oxygen atom.

1. True
2. False

Q. When magnesium is burnt in the air, there is an increase in mass after the reaction. Why?

Q.

Noble gases are more reactive because of their fully filled outer orbits.

1. True

2. False

Q.

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Q.

What is valence shell ? What are valence electrons ?

Q.

Define valency

Q. What is the valency of aluminium?

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

Q. The electronic configuration of lithium atom is .

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

Q. What is the electronic configuration of oxygen (atomic number 8)?

1. 2, 6
2. 4, 4
3. 8
4. 6, 2

Q. What is the valency of calcium?
(atomic number = 20)

1. $6$
2. $2$
3. $1$
4. $8$

Q. If the valency of chlorine is 1 and it forms a compound with magnesium whose formula is ${\text{MgCl}}_2$. What will be the valency of magnesium?

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

Q. An element $A$ is tetravalent and another element $B$ is divalent. The formula of the compound formed by the combination of these elements is:

1. $A_{2}B$
2. $A{B}_2$
3. $A_2{B}_3$
4. $AB$

Q. Fill in the blanks:
i. ____________ taste is a characteristic property of all acids in aqueous solution.
ii. Acids react with some metals to produce _____________ gas.
iii. Because aqueous acid solutions conduct electricity, they are identified as ________
iv. Acids react with bases to produce a ________ and water.
v. Acids turn ____________ different colours.

Q. The electronic configuration of lithium atom is .

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

Q. Match the given elements with their respective valency.

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

Q. Elements X , Y and Z have atomic number 6 , 9 and 12 respectively.Which one
(1) will form an anion?
(2) will form a cataon?
(3)has 4 electron in its outermost shell ?

Q. Write down the valency of the following ions.​

Q. Tha valency of sodium is ______

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

Q. All of these radicals have a valency of 2, except :

1. ${SO}_4$
2. ${CO}_3$
3. ${NH}_4$
4. $Mg$

Q. Valency of carbon is _______ and valency of aluminium is ________ .

1. 4, 2​
2. 3, 4​
3. 3, 1​
4. 4, 3​

Q. What is the electronic configuration of magnesium $\left({}_{12}^{24}Mg\right)$?

1. 2, 8, 2
2. 2, 6, 4
3. 2, 8, 3
4. 2, 9, 1