This week:

This week:



We learned about the periodic table. :O
It was invented in the 1700s by a scientist named Mendeleev (Men-dal-lay-yev)
The table is organized by trends that go from left to right and up to down. Most of the metals are on the left side, and the right side is nonmetals. If you go down a group, the reactivity, atomic size, and atomic mass get bigger (except for the halogens, where it goes from bottom up, with Flourine being the most reactive)~

If you go from left to right, the atomic size gets smaller but the mass gets bigger, because they have more protons and it makes the atom heavier but smaller at the same time. The alkali metals on the left are really reactive to water, while the noble gases at the very far right are completely unreactive~