kallyavilez5 kallyavilez5

23-06-2018
Chemistry

contestada

Which is an element?
A: H20
B: NaCl
C: Mg
D: CO

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Nonportrit Nonportrit

23-06-2018

The answer is option D "CO." Co also known as Cobalt is the 27th element on the periotic table. It was discovered in 1735, it's boiling point is 3200 k.

Atomic mass: 58.9332
Protons: 27
Neutrons: 32
Electrons: 27

Hope this helps!

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jenn16929 jenn16929

23-06-2018

D is the answer. The others are compounds not single elements

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