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Eva8 [605]
3 years ago
8

Which among the following is the most electropositive metal?​

Chemistry
1 answer:
pishuonlain [190]3 years ago
8 0

Answer:

The alkali metals are the most electropositive. Cesium is the most electropositive of the stable elements.Francium, while unstable, is theoretically the most electropositive element. Electropositivity increases down groups and decreases along periods (from left to right) on the periodic table.

hope it helps

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The number 0.000402 expressed in scientific notation is
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Answer:

Explanation:

Your strategy here will be to

use the chemical formula of carbon dioxide to find the number of molecules of

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2

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use Avogadro's constant to convert the number of molecules to moles of carbon dioxide

use the molar mass of carbon dioxide to convert the moles to grams

So, you know that one molecule of carbon dioxide contains

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Now, one mole of any molecular substance contains exactly

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In your case, the sample of carbon dioxide molecules contains

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⋅

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⋅

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1

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2

=

¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯

∣

∣

a

a

1.8 g

a

a

∣

∣

−−−−−−−−−

The answer is rounded to two sig figs, the number of sig figs you have for the number of atoms of oxygen present in the sample.

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