20. an atom has a mass of 50 and 20 protons. how many
neutrons does it have?

The minerals found in bones are deposited by living cells called

The table compares the number of electrons in two unknown neutral atoms. comparison of electrons atom number of electrons a 10 d 11 use this information to determine the number of valence electrons in the atoms. which of the following correctly compares the stability of the two atoms? both are unreactive. both are highly reactive. a is unreactive and d is reactive. a is reactive and d is unreactive.

In an exothermic reaction, energy may be released to the surroundings in the form of question 4 options: heat light thermal all of the above