Answer:
highest first ionization energy - Br
smallest atomic size - Br
most metallic character - Na
Explanation:
Ionization energy of Br is higher than P because higher zeff value
Sodium is more metallic than calcium because it is able to loose electron more readily as compared to calcium because of higher electro positivity.
Atomic radius of Br is the smallest as its atomic radius is 114, P (115), Ca (197), Na (186)
Kinetic energy of the molecules increases and we are close to boiling point liquids. Then strain the liquid and gas pressure reached equilibrium
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P S
4 10
you just use the roots given in the molecular formula
Answer:

<u>A. Skin</u>
Explanation:
Skin unlike teeth, bones & shells is fragile & get decomposed easily under the soil.
Prediction, control and experiment