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17 January, 01:08

Identify the period or group number described for the following case:

a) contains elements C, N and O

b) start with helium

c) Contains the alkali metals

d) end with neon

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Answers (1)
  1. 17 January, 04:05
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    A) Period 2.

    b) Group 18.

    c) Group 1.

    d) Period 2.
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