Which value represents the first ionization energy of a nonmetal? (1) 497.9 kJ (2) 577.4 kJ (3) 811.7 kJ (4) 1000. kJ

What determines the average kinetic energy of the particles in a gas? a. the number of collisions b. the number of particles c. the size of the particles d. the temperature

As we move from left to right across the periodic table, what is the general trend? a) atomic radii increase. b) electronegavitiy decreases. c) nuclear shielding increases. d) metallic character decreases.

Rays from the sun are not considered matter true or false