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In-s [12.5K]
3 years ago
10

MULTIPLE CHOICE QUESTION

Chemistry
1 answer:
marishachu [46]3 years ago
5 0
Mg will lose 2 valance electrons to obtain octet
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What happens in a voltaic cell?
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How many electrons does an element have if its atomic number is 20
olga55 [171]

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20 electrons

A neutral atom with atomic number 20 will have 20 electrons.

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3 years ago
Which elements are out of order in terms of atomic mass. co,Ni or Li,be or I,xe​
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The pair co,Ni is out of order in terms of atomic mass

Explanation:

For co,Ni

Atomic mass of Co = 58.9331 u

Atomic mass of Ni = 58.6934

For Li,be

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Atomic mass of  be = 9.012182 u

For I,xe

Atomic mass of I =  126.90447 u

Atomic mass of Xe = 131.293 u

Hence, the pair co,Ni is out of order in terms of atomic mass

7 0
3 years ago
When heated, calcium carbonate goes through a chemical reaction, and produces calcium oxide (quick lime) powder and carbon
Contact [7]

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Carbon dioxide is produced, and as a gas, it was not captured to measure its mass.

Explanation:

4 0
4 years ago
Read 2 more answers
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