Correct the mistakes, if any in the following statement.
i) Second period is a short period. It contains only two elements.
ii) Group $18$ elements are called Halogen family.

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Solution

i) First period is a shortest period. It contains only two elements (or) second period is a short period. It contains eight elements.
ii) Group $18$ elements are called noble gases or inert gases (or)
Group $17$ elements are called halogen family

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Q. Elements in the halogen family belonging to 17th group in the periodic table show similarity in their properties .

What is the electronic configuration of the second element in the halogen family of the second period?

Q. Correct the mistakes, if any in the following statement. In a period, the metallic character of the element increases while their non metallic character decreases.

Q. Solve the crossword puzzle.

A	L	K	A	L	I	G	V	K	L
L	G	M	N	P	E	R	I	O	D
K	O	P	H	A	L	O	G	E	N
A	L	P	Q	R	S	U	T	U	E
L	D	A	Z	Y	X	P	W	V	O
I	O	D	I	N	E	B	C	D	N
N	O	B	L	E	G	A	S	E	S
E	A	C	T	I	N	I	D	E	S

CLUES

	DOWN		ACROSS
a.	vertical columns are called_______	a.	horizontal rows are called_________
b.	second group elements are named __________earth metals.	b.	first group elements are called________
c.	an inert gas used in advertisement bulbs.	c.	group 17 elements are called__________
d.	a yellowish shining metal weighed in carats.	d.	group 18 elements are called__________
		e.	belongs to halogen family and helps in thyroid treatment
		f.	inner transition elements present in the 7th period

Fill in the following blanks with suitable words :

(a) The basis for the modern periodic table is ……………

(b) The horizontal rows in a periodic table are called ……………

(d) Group 17 elements are known as ……………

(e) Group 18 elements are called ……………

(f) According to Newland’s classification of elements, the properties of sulphur are similar to those of oxygen because sulphur is the …………… element starting from oxygen.

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A	L	K	A	L	I	G	V	K	L
L	G	M	N	P	E	R	I	O	D
K	O	P	H	A	L	O	G	E	N
A	L	P	Q	R	S	U	T	U	E
L	D	A	Z	Y	X	P	W	V	O
I	O	D	I	N	E	B	C	D	N
N	O	B	L	E	G	A	S	E	S
E	A	C	T	I	N	I	D	E	S

A	L	K	A	L	I	G	V	K	L
L	G	M	N	P	E	R	I	O	D
K	O	P	H	A	L	O	G	E	N
A	L	P	Q	R	S	U	T	U	E
L	D	A	Z	Y	X	P	W	V	O
I	O	D	I	N	E	B	C	D	N
N	O	B	L	E	G	A	S	E	S
E	A	C	T	I	N	I	D	E	S

Correct the mistakes, if any in the following statement.i) Second period is a short period. It contains only two elements.ii) Group 18 elements are called Halogen family.

i) First period is a shortest period. It contains only two elements (or) second period is a short period. It contains eight elements.ii) Group 18 elements are called noble gases or inert gases (or) Group 17 elements are called halogen family

Correct the mistakes, if any in the following statement.
i) Second period is a short period. It contains only two elements.
ii) Group $18$ elements are called Halogen family.

i) First period is a shortest period. It contains only two elements (or) second period is a short period. It contains eight elements.
ii) Group $18$ elements are called noble gases or inert gases (or)
Group $17$ elements are called halogen family

A	L	K	A	L	I	G	V	K	L
L	G	M	N	P	E	R	I	O	D
K	O	P	H	A	L	O	G	E	N
A	L	P	Q	R	S	U	T	U	E
L	D	A	Z	Y	X	P	W	V	O
I	O	D	I	N	E	B	C	D	N
N	O	B	L	E	G	A	S	E	S
E	A	C	T	I	N	I	D	E	S