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vovikov84 [41]
2 years ago
11

Isotopes have similar

Chemistry
1 answer:
zysi [14]2 years ago
3 0

Answer:

To my knowledge, it should be the last 2

Explanation:

1. Incorrect as atoms make up elements when they all have the same properties

2. Incorrect, an element can have other similar elements, they're ordered like that in the periodic table

3. Correct as atoms are made up of mostly space, with mass concentrated at the center of the atom, the nucleus and a few tiny electrons in orbit as proved by Rutherfords alpha particle scattering experiment

4. Correct, Atoms are known as the building blocks of matter

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egoroff_w [7]

Answer:

Explanation:

Magnesium when it oxidizes has a valence of 2.

Oxygen, when it mixes with something, has a valence of - 2

So Mg and O2 will form something, but what? The answer is MgO

Mg + O2 ===> MgO

To balance this equation, you need 2 Magnesiums on the right and 2 Oxygens also on the right. The left will need a  two Magnesiums.

The balanced equation will be

2Mg + O2 ====> 2MgO

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