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Chemistry Past Questions

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44 questions JAMB 2505 WAEC 1623 NECO 168 CUSTOM 10

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44 questions

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Question 21

waec 2008

What is the atomic number of an element whose cation Y⁺ has the electronic configuration 1s²2s²2p⁶?

B10

C11

D12

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Question 22

waec 2008

The valence electrons in a chloride ion are [₁₇CI]

A2p electrons only

B3s and 3p electrons only

C3p and 3d electrons only

D3p electrons only

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Question 23

waec 2008

Find the number of neutrons in an atom represented by 45₂₁X.

A21

B24

C45

D66

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Question 24

waec 2008

The mass spectrometer can be used to measure mass of

Aan atom

Ban electron

Ca proton

Da neutron

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