How do atomic mass and atomic number change across and dow the periodic table of elements?

Which statement best describes how the temperature of the ocean's surface water varies / A. areas with a low salinity have the coldest water B. areas close to the poles have the warmest water C. areas at high altitude have the coldest water D.

Lithium and potassium have similar chemical properties because the atoms of both elements have the same (1) mass number (2) atomic number (3) number of electron shells (4) number of valence electrons

Do you think that each sample occupies

and is laid down in layers through processes of

1. A student tried to solve the following problem by selecting the tile as shown. What if anything, did the student do wrong? A. The student chose the wrong tile to solve the problem. B.

How many neutrons does element X have if its atomic number is 39 and its mass number is 75?

Enter a chemical equation for LiOH (aq) LiOH (aq) showing how it is an acid or a base according to the Arrhenius definition. Consider that strong acids and bases dissociate completely. Express your answer as a chemical equation.

Percent copper in brass lab

Which statement best describes Rutherford's model of the atom?

If a net force of 5.0 forward acts on a 0.60 kg toy car, what is it's acceleration?