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Chemistry

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Oxygen reacts 1:2 with sodium and is a colourless gas; chlorine reacts 1:1 with sodium and is a yellow gas; neon does not reacts with sodium and is a colourless gas. Suppose that a new element , pretendium, has been dicovered, and it is noted that this element reacts 1:1 with sodium and is bright green as a gas.

A) which chemical family would it belong to?

-I think halogens.

B) How many electrons would it have in its outermost shell?

-7?

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