Answer:
1) K and Rb
2) 20 protons, 20 neutrons, and 20 electrons.
Explanation:
1) If it's in the same column, it has the same # of valence electrons (e- on the outer shell), therefore similar chemical properties.
2)
1) atomic #, 20, is the number of protons
2) subtract the mass number from # of protons, which you get 20 neutrons
3) Number of electrons in a neutral atom = number of electrons, which is 20. You can also check yourself by looking at electron configuration on a full periodic table.
Answer: Compound
Explanation:
Copper(II) oxide or cupric oxide is the inorganic compound with the formula CuO. A black solid, it is one of the two stable oxides of copper, the other being Cu₂O or copper(I) oxide. As a mineral, it is known as tenorite.
Answer:
Destruction of rocks at convergent boundaries
Explanation:
Duuuuuuuuude. Dude.
Let's think for a sec, because this confused me.
Acid rain is chemical weathering. It has acid in it, so it weathers rocks. (Ewwww.)
Frost wedging is a major duh, because frost can weather rocks.
Oxidation reactions are a yes yes because it becomes oxidized.