130 Ba a. 56 c.Ti e. ÇLi 22 136 Ba d. STi 48 22 f. Li 56

Fill in the blanks. The positions of atoms on the periodic table of the ____ are determined by how many _____  are present in their nuclei; this also is called their atomic _____.  An atom's nucleus is made up of protons, which have _____ charges and ___ that do not have a ____charge.  The total of protons and neutrons in an atom defines its atomic ____ .  Two atoms with the same number of protons but different numbers of neutrons in their nuclei are considered _____ . The nucleus is surrounded by electrons, which have  charges.  Electrons are not found randomly, but occur in discrete _____ that are grouped into "shells".  The chemical properties of an atom, that is, the kinds of chemical reactions it has with other atoms or molecules, are determined by properties of its outermost set of orbitals, which is called its _____ shell.  Two atoms will react with each other if the reaction leads to a more stable state; specifically so that their valence shells are ____  .  The most common…

Hydrogen has three isotopes: protium, deuterium, and tritium.  Which of the following statements about these three isotopes is TRUE?      options:   Individually, all of them each weigh 1.0079 atomic mass units   They are found in equal proportions in nature   They all have the same mass number   They all have the same atomic number   They all contain different numbers of protons

Chlorine-35 is one isotope of chlorine.  (35 is the mass number.)  Chlorine-37 is another isotope of chlorine.  How many protons and how many neutrons are in each isotope of chlorine?