4 years ago

Which is an element hydrogen , air , carbon dioxide , water

Chemistry

2 answers:

Basile [38]4 years ago

8 0

Answer:

Hydrogen is an element

Explanation:

Hydrogen is an element with only hydrogen atoms, whereas air, carbon dioxide, and water are all made up of multiple elements with different types of atoms.

suter [353]4 years ago

3 0

Answer: hydrogen

Explanation:

An element is a substance whose atoms have the same number of protons it’s not air because it is a mixture it is not water because it is a compound and carbon dioxide is a compound...

Hope this helped!!!!!!!

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Which of these pairs of elements have the same number of valence electrons?

ElenaW [278]

The correct answer is the second option; sodium (Na) and potassium (K.)
Both sodium and potassium have the same number of valence electrons.

6 0

3 years ago

What is the third alkali metal

andrey2020 [161]

Answer:

potassium

The third alkali metal is K (potassium). The atomic number of K (potassium) is 19. Thus, the atomic number of third alkali metal is 19