What does the period number of an element indicate?

Number of occupied electron shells

Class 9 Chemistry · Chapter 8 · Test 3

Configuration and Periodic Position

25 MCQs covering electronic configuration, determination of period, group and block, outermost-shell electrons, and placement of elements in the modern periodic table.

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
An element has an outermost electronic configuration of s2p3. To which block does it belong?
- As-block
- Bp-block
- Cd-block
- Df-block
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Answer: B
The p subshell is being filled so the element belongs to the p-block.
Question 2
An element has an outermost configuration of s2. To which block does it belong?
- As-block
- Bp-block
- Cd-block
- Df-block
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Answer: A
The s subshell is being filled so the element belongs to the s-block.
Question 3
An element has an outermost configuration of s2p5. To which block does it belong?
- As-block
- Bp-block
- Cd-block
- Df-block
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Answer: B
The p subshell is being filled so the element belongs to the p-block.
Question 4
What does the period number of an element indicate?
- ANumber of occupied electron shells
- BNumber of neutrons
- CNumber of protons lost
- DNumber of isotopes
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Answer: A
The period number corresponds to the highest occupied electron shell.
Question 5
An element has the shell configuration 2 8 1. In which period is it located?
- APeriod 1
- BPeriod 2
- CPeriod 3
- DPeriod 4
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Answer: C
The element has three occupied shells so it belongs to period 3.

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