1.	The lightest liquid metal is ?
	Cs
	Ga
	Fr
	Hg
	Answer: Cs Explanation:
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2.	Which of the following elements does not lose an electron easily ?
	Al
	Mg
	Na
	F
	Answer: F Explanation: Smaller the atomic radius of an element, more difficult is lose electron. Among Na, F, Mg and Al, F has the smallest size. Also, it contains 7 electrons in its valence shell and it is most electronegative element. Hence, it does not lose an electron easily rather it gains electron easily. Note: Elements of 2nd period have smaller size than those of the corresponding elements of the 3rd period. Further in a period, halogens have the smallest size. F belongs to 2nd period and rest three to 3rd period.
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3.	The elements a, b, c, d and e have atomic number 9, 11, 17, 12 and 13 respectively. which pair of elements belongs to the same group ?
	D and E
	A and C
	B and D
	A and B
	Answer: A and C Explanation: Electronic configuration of A (atomic number 9) is 2, 7. Electronic configuration of B (atomic number 11) is 2, 8, 1. Electronic configuration of C (atomic number 17) is 2, 8, 7. Electronic configuration of D (atomic number 12) is 2, 8, 2. Electronic configuration of E (atomic number 13) is 2, 8, 3. Elements which differ in atomic number by 8 i.e., 9 (A fluorine) and 17 (Cl chlorine) lie in the same group i.e., group 17 (halogens).
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4.	An element has an atomic number of 15 with which of the following elements will it show similar chemical properties ?
	O (8)
	N (7)
	Ne (10)
	Be (4)
	Answer: N (7) Explanation:
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5.	The family of elements having seven electrons in the outermost shell is ______ ?
	halogens
	noble gases
	alkali metals
	alkaline earth metals
	Answer: halogens Explanation:
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6.	Elements belonging to groups 1 to 17 are called __________ ?
	inner transition elements
	transition elements
	noble gases
	normal elements
	Answer: normal elements Explanation:
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