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german
3 years ago
11

Which family on the periodic table contains elements that already have the octet in their valence energy level? a:family 1 b:fam

ily 13 c:family 15 d:family 18?
Chemistry
2 answers:
Vanyuwa [196]3 years ago
6 0
D family 18 is the answer
Scilla [17]3 years ago
5 0

<u><em>Answer:</em></u>

  • Correct option is D. Family 18

<u><em>Explanation.</em></u>

The elements of group 18 of periodic table are called as noble gases. They are stable because they have complete valence shell electrons. So there octet rule is satisfied.

The elements of noble gases are

  • He
  • Ne
  • Ar
  • Kr
  • Xe
  • Rn
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The concentration after dilution is 1.4%.

We are aware that concentration and volume are related to each other by the formula -

C_{1} V_{1} = C_{2} V_{2}, where we have initial concentration and volume on Left Hand Side and final concentration and volume on Right Hand Side.

Keep the values to calculate final concentration.

C_{2} = (53.5 × 5.4)/205.0

Performing multiplication on Right and Side

C_{2} = 288.9/205.0

Performing division on Right Hand Side

C_{2} = 1.4%

Hence, the final concentration is 1.4%.

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The complete question is -

A 53.5 mL sample of an 5.4 % (m/v) KBr solution is diluted with water so that the final volume is 205.0 mL.

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