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DiKsa [7]
3 years ago
12

How do elements have such a different properties

Chemistry
1 answer:
steposvetlana [31]3 years ago
7 0
I’m not sure if this will help, but protons make different elements. That’s how we can tell the difference between elements!
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How many protons, neutrons, and electrons does a magnesium atom with a mass number of 25 contain?
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How many atoms are in 766.3 grams of Li?
34kurt

1 mol of any substance is made of 6.022 x 10²³ units, these units could be atoms making up elements or molecules making up a compound.

In this case. 1 mol of Li is made of 6.022 x 10²³ atoms of Li

The molar mass of Li is 6.94 g/mol

Therefore mass of 1 mol of Li is 6.94 g

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Then in 766.3 g of Li there are - 6.022 x 10²³ atoms / 6.94 g x 766.3 g = 665 x 10²³

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