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ipn [44]
3 years ago
11

Which element is the most reactive? sodium nickel carbon oxygen

Chemistry
1 answer:
leva [86]3 years ago
4 0

Sodium .

  • Atomic no-11
  • Electronic configuration=\sf 1s^22s^23s^1
  • Short name=Na
  • Latin name=Natrum
  • Period=3rd
  • Group=1st
  • Block=s-block
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Why are numbers placed before the elements and molecules in a<br>chemical equation?​
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Answer:

the are coefficients for the atom. the tell how many there are.

Explanation:

they tell you how many atoms there are of its type.

ex. 4 C²H³. there are 4 of the c² and h³ (couldn't find a way to use subscript so used the power signs to show.)

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3 years ago
Ions are formed when atoms a) gain or lose protonsb) gain or lose electronsc) gain or lose neutrons d) each of these results in
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Answer:

b) Gain or lose electrons

Explanation:

An ion is an electrically charged particle. For an atom to be charged, it must have gained or lost electron in the process and therefore, it becomes an ion.

The loss or gain of electrons is what makes an atom charged and eventually becomes an ion.

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3 years ago
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Answer:

Explanation:

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From above; Na⁺ and Cl⁻ appear on both sides;

Hence, the net ionic equation is:

\mathbf{2Ni^{2+}_{(aq)}+2S^{2-}_{(aq)} \to 2NiS_{(s)}}

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