i)The number of electrons in the outermost shell of alkaline earthmetals is________
A] 1
B] 2
C] 5
D] 7
ii) According to the modern periodic law properties of the elements are a periodic function of
their___________
A] Atomic masses
B] Atomic numbers
C] Densities
D] Boiling point
iii)The near point for the normal human eye is__________cm
A]10
B]20
C]25
D]30
iv)A person with weight 72N on the earth will weigh______N on the moon
A]12
B]36
C]31
D]63
v]The vapour content in the air is measured using a quantity called___________
A] Absolute Humidity
B] Relative Humidity
C] Dewpoint
D] Humidity
Answers
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2
1. 2
2. atomic numbers
3. 25
4. 12N
5. humidity
Explanation:
1. All the alkaline earth metals have 2 electrons in their valence shell so as to form doubly charged +ve ions.
2. The physical and chemical properties of the elements are periodic functions of their atomic numbers.
3. Distance where a normal human eye can see clearly without stress or strain is called the near point of human eye.
4. A person's weight on earth is 6 times than that of his weight on the moon.
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