Why does the atomic size of group 1 elements increase down the group

The number of protons decreases

Class 9 Chemistry · Chapter 9 · Test 10

Group Properties Review

25 MCQs covering the major concepts of Chapter 9 including group 1 group 17 transition elements noble gases oxidation and reduction hydrogen halides catalysts and the physical properties of metals and non-metals.

MCQs

25 questions · 20 min · 25 marks

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Sample questions

The first 5 of 25. Try each one, then tap to see the answer.

Question 1
How many electrons are present in the outermost shell of group 1 elements
- AOne
- BTwo
- CSeven
- DEight
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Answer: A
Group 1 elements have one electron in their outermost shell.
Question 2
What happens to the reactivity of group 1 metals down the group
- AIt increases
- BIt decreases
- CIt remains constant
- DIt becomes zero
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Answer: A
Reactivity increases down group 1 because the outer electron is lost more easily.
Question 3
Why does the atomic size of group 1 elements increase down the group
- AMore electron shells are added
- BThe nucleus disappears
- CThe number of protons decreases
- DThe outer electron is removed
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Answer: A
Atomic size increases down group 1 as additional electron shells are added.
Question 4
What happens to the melting points of group 1 metals down the group
- AThey decrease
- BThey increase
- CThey remain constant
- DThey become zero
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Answer: A
Melting points decrease down group 1 because interatomic attraction becomes weaker.
Question 5
How many electrons are present in the outermost shell of group 17 elements
- ASeven
- BOne
- CTwo
- DEight
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Answer: A
Group 17 elements have seven outer electrons.

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