Which of the following is correct? If the name and symbol are correct write TRUE but if the symbol is wrong write the correct symbol. 6 marks Nickel, N
Chromium, Cr
Sodium, S
Silver, Si
Potassium, P
Fluorine, F

False, as a substance changes from a solid to a liquid and from a liquid to a gas the molecules get farther apart from each other

The closer the atoms are to becoming ionic the more highly dense the negatively charged side gets.

Radon-222 or rn-222 has a half-life of 3.82 days. to determine the fraction of an original sample of rn-222 that remains unchanged after 7.646 days, we calculate the amount of rn-222 remaining after 7.646 days and divide it with the original amount. using 1 gram as a basis and using half-life calculation methods, we can determine that  0.249 or 0.25  grams of rn-222 will remain, and thus the fraction remaining is 0.25 or 1/4.