CHEM 1A Study Guide - Atomic Theory, Alkaline Earth Metal, Metalloid

• School: UC-Irvine
• Department: Chemistry
• Course: CHEM 1A
• Professor: All

Document Summary

Chemical principles: the quest for insight by atkins and jones. Element: a substance composed of only one type of atom. Atom: the smallest part of an element that can exist. Atomic number: number of protons in the nucleus: atomic number defines the element"s identity, denoted by letter z. Nucleus makes up most of the mass of an atom. Atoms can be of the same element but have different masses due to neutrons. Mass number: total number of protons and neutrons in an atom. Mass in kilograms of atomic particles: electron 9. 109 x 10^-31, proton 1. 673 x 10^-27, neutron 1. 675 x 10^-27 isotopes: atoms with the same atomic number but different mass numbers. Groups 1 and 2 are the s-block the alkali (group 1) and the alkaline earth (group 2) metals. Groups 3-12 are the d-block transition metals. Groups 13-18 are the p block nonmetals, halogens, noble gases.