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10-04-2018
Chemistry

contestada

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

Respuesta :

10-04-2018

a) Period 2.
b) Group 18.
c) Group 1.
d) Period 2.

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