What do elements in the first two columns of the periodic table have in common?
a.) they have two valence electrons
b.) they tend to lose electrons to gain stability
c.) they react strongly with the alkali metals
d.) they do not react with halogens

There are 6.022, 104 atoms of hg in 1 mole of hg the number of atoms in 45 moles of hg can be found by multiplying 4.5 by 6.022, 102 which is the number of atoms in 4.5 moles of hg, correctly written in scientific notation with the correct number of significant figures? 0 21,109 0 21,100 271, 1024 27.099, 100 mark this and retum save and exit submit

Avolleyball player hit a ball with a mass of 0.25 kg. the average acceleration of the ball is 15.5 m/s². how much force did the volleyball player apply to the ball? 62.0 n 3.87 n 62.0 m/s² 3.87 m/s²

Atoms contain subatomic particles called protons and neutrons. when these protons and neutrons spilt, a lot of energy is released