Which property of an atom's structure was used to organize the periodic table?

a.
outermost electron

b.
total electrons

c.
total protons

d.
outermost protons

What happens when light is scattered?

When an experimenter draws a conclusion that he assumes will apply to all situations set up similarly to his test situation, even though he cannot possibly have examined all possible test scenarios, the experimenter is using deductive reasoning inductive reasoning abductive reasoning subjective reasoning

Can anyone answer these questions? ? i need it before 1: 00pm today