What makes up nearly all of the atom's mass?

Systematic names for Cul (s)

1 Mr. Chavez paid $14.32 total for 8 protein bars. If each protein bar cost the same amount, how much did one protein bar cost? A $1.69 C $1.79 B $1.82 D $1.59

What information is needed to determine the energy of an electron in a many-electron atom? Check all that apply.

What happens to oceanic crustand mantle after subduction?

When the pressure changes from 1.21 atm to 2.52 atm, the volume changes from 3.75 L to 1.72 L and the temperature changes from 293 K to _ k

15.00 g of NH4HS (s) is introduced into a 500. mL flask at 25 °C, the flask is sealed, and the system is allowed to reach equilibrium. What is the partial pressure of ammonia in this flask if Kp = 0.108 at 25 °C for: NH4HS (s) ⇄ NH3 (g) + H2S (g) ?

Among elements 1-18, which element or elements have the smallest effective nuclear charge if we use the equation zeff=z-s to calculate zeff? check all that apply.

Two clear solutions are placed in separate beakers. The first solution has a pH of 4, and the pH of the second solution is unknown. If the two solutions are mixed and the resulting pH is 5, the second solution must have

Based on its location on the periodic table, which element (s) have properties similar to N? Choose all that apply. * P C O Bi

What conclusion can be drawn from the statement that an element has low electron affinity, low electronegativity, and a low ionization energy?