Period 2 Units 1-4 Review by Matthew Dennis

What are we struggling with?

dennism1 — 2015-12-09 15:28:53 UTC

Post questions here that you would like me to discuss before the end of class.

UNITS 1-4 Only

2015-12-09 15:36:57 UTC

metalloids have properties of both metals and nonmetals. the touch the stairsteps on the PT (B, Si, Ge, As, Sb, Te, Po, At

2015-12-09 15:38:05 UTC

protons = atomic number

electrons = protons

neutrons = mass number - protons

2015-12-09 15:38:08 UTC

protons and neutrons - mass of 1. (electrons mass of 0)

2015-12-09 15:39:03 UTC

groups are columns, periods are rows

2015-12-09 15:41:31 UTC

try number 5 on the Unit 3 Check for understanding. I will go over these

2015-12-09 15:41:55 UTC

fission is the splitting of atoms

fusion is the joining together of two atoms

2015-12-09 15:43:29 UTC

not sure what you mean

2015-12-09 15:44:16 UTC

atoms get smaller going left to right across a row

atoms get smaller going up a column

2015-12-09 16:15:27 UTC

do groups go up and down or left and right

2015-12-09 16:18:59 UTC

alpha - helium nucleus - charge of +2, mass of 4

beta - electron - charge of -1, mass of 0

positron - positive electrons, charge of +1, mass of 0

gamma - energy

2015-12-09 16:26:35 UTC

alpha stopped by skin/cloths

beta stopped by metal/wood

gamma stopped by lead