The standard size of an atom is <span>1 X 10 -8 cm.
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The correct answer is option B. The most dense phase of matter is the solid phase and the least dense are gases. However, there is an exception. Water is the exception. Solid water or ice is less dense than the liquid phase therefore it floats on liquid water.
Li is in group 1 so it has same number of valence electrons as hydrogen.
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Answer:
In every sequence even numbers are added in order.
3, 5, 9, 15, 23, 33
