Which property decreases when the element in group 17 are considered in order of increasing atomic number

Litmus paper is made from water-soluble dyes which are extracted from lichens. this paper is used as an acid-base indicator. which of these common household substances would turn blue litmus paper red? a) bleach b) lye c) soap d) vinegar

Asingle atom of an element has 21 neutrons, 20 electrons, and 20 protons. which element is it? ok o z

Consider the nuclear equation below. 239/94 pu—-> x+ 4/2 he. what is x?