1 elements
2 they have same number of valence electrons
3 period
Physical change , the states are changing from liquid to gas
Answer: This comes to bear because of what is known as resonance effect Or mesomeric effect In chemistry.
Explanation:
The concept of resonance effect reveals about the polarity induced in a molecule by the reaction between a lone pair of electron and a pi bond. It also occurs by the interaction of 2 pi bonds in the adjacent atoms.
2. <span>1/8 = (1/2)³ </span>
<span>so it's 3 half lives.</span>
