poisons

element

an element is a pure substance made up of just one type of atom.

element diagram

compound

a compound is a pure substance made up of more than one element that are chemically bonded together

compound diagram

mixture

A mixture is formed when two or more elmenst or coumpounds are present without being chemically bonded

mixture diagram

water formula

H20

carbon dixoide formula

CO2

Salt formula

NaCI

similarities between modern periodic table and mendeleev’s

They both utilise periods and group to help identify elements properties and Elements with similar properties are grouped together

Differences between modern periodic table and mendeleev’s

Modern Perodic table is complete with all the elements in the table as it doesn’t have gaps and use to be orgnised by atomic mass, now organised by atomic number

Protons

1AMU, positively charged, located in nucleus

netrons

1AMU, uncharged particles, found in nucleus

electrons

1/1836, negatively charged, found in outershells around the nucleus

valance shell

The outmost electron shell of an atom. This shell determines its reactivity, or tendency to form chemical bonds with other atoms.

electron configuration

2,8,8