Periodic Table Archives - Page 15 Of 15

Which of the following properties do not match with elements of the halogen family?
(a) They have seven electrons in their valence shell.
(b) They are highly reactive chemically.
(c) They are metallic in nature.
(d) They are diatomic in their molecular form.

(ii) They are metallic in nature. Reason Halogens are non-metallic in character.

In the periodic table, alkali metals are placed in the group ………..
(a) 1
(b) 11
(c) 17
(d) 18

(i) 1 Reason In the periodic table, alkali metals are placed in the group 1 as they have one electron in the outer most shell.

Select the correct answer :
(i) Across a period, the ionization potential ………. (increases, decreases, remains same).
(ii) Down the group, the electron affinity ………. (increases, decreases, remains same).

(i) Across a period, the ionization potential increases. (ii) Down the group, the electron affinity decreases

Give reasons – The oxidizing power of elements increases from left to right along a period.

The oxidizing power of elements increases from left to right along a period because electro-negativity and the non metallic character increases from left to right. As oxidizing power depends on…

Define the following terms: (i) Ionization potential (ii) Electron affinity

(i) Ionization Potential is the amount of energy required to remove an electron from the outer most shell of an isolated gaseous atom. (ii) Electron affinity is the amount of energy released when an…

Atomic number of an element is 16. State :
(i) To which period it belongs.
(ii) The number of valence electrons in the element.
(iii) Is the element a metal or a non metal.

(i) It belongs to the 3rd period. (ii) The number of valence electrons are 6. (iii) It is a non metal.

State the correct answer.
(i) The number of electrons in the valence [outermost] shell of a halogen is :
(a) 1
(b) 3
(c) 5
(d) 7
(ii) Electro negativity across the period – increases/decreases.
(iii) Non metallic character down the group – increases/decreases.

(i) The number of electrons in the valence shell of halogen is 7. (ii) Electro negativity across a period - increases. (iii) Non metallic character down the group - decreases.

Define the following term – Ionization Potential.

Ionization Potential is the amount of energy required to remove an electron from the outer most shell of an isolated gaseous atom.

Consider the section of the periodic table given below:
Group numbers 1A 1 IIA 2 IIIA 13 IVA 14 VA 15 VIA 16 VIIA 17 O 18
Li D O J Ne
A Mg E Si H K
B C F G L

Some elements are given in the above table in their own symbol and position in the periodic table, while others [shaded] are shown with a letter. With reference to the table:
(i) Which is the most electronegative?
(ii) How many valence electrons are present in G?
(iii) Write the formula of the compound between B and H.
(iv) In the compound between F and J, what type of bond will be formed?
(v) Draw the electron dot structure for the compound formed between C and K.

1A 1	IIA 2	IIIA 13	IVA 14	VA 15	VIA 16	VIIA 17	O 18
Li		D			O	J	Ne
A	Mg	E	Si		H	K
B	C		F	G			L

(i) J is the most electronegative. (ii) G has 5 valence electrons. (iii) B2H is the name of the compound between B and H. (iv) Covalent bond will be formed between F and J. (v) Electron dot structure…

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