Question # 1

Period nuebr tells abou the

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No. of valance electrons

No. of electronic shells

Both a and b

None of the above

How many elements are present in 6th period.

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2

8

18

32

4th and 5th priod of the long form of periodic table are called.

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Short periods

Normal periods

Very long peiods

Long periods

The colour of anhydrous cobalt(II) cholride solid

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White

Black

Pink

Blue

What is the mass of AI in 204 g of aluminium oxide Al₂O₃

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26 g

54 g

108 g

27 g

The haviest metal is

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Iron

Lead

Osmium

Platinum

Emperical Formula of Glucose is

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CH2O

CHO

CHO2

C2HO

Every atom has a natural tendency to accommodate electrons in its valence shell

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2 or 6

2 or 4

2 or 8

2 or 10

What will be the relative atomic mass of nitrogen given the abundance of its two isotopes, ¹⁴ N and ¹⁵N are 99.64 and 0.35

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14.0210

14.2100

14.0021

14.1200

Elements o group 13 to 18 have thier valence electrons is subshell

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s

p

f

d

40 g of H₃PO₄ contains numebr of moles

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0.58 g

4.8 g

5.8 g

0.408 g

How is radio carbon dating useful for archeolgists.

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It helps detemine whether the matter is radioactie or not

It helps determine the age of organic matter

It helps determine the composition of matter

It helps deterime the usefulness of matter

The elements of group 3 to 12 are clled.

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Normal elements

Halogens

Noble gases

Transition elements

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