8Fa Dalton's Atomic model gamma

Atoms can be divided into smaller parts

Atoms of the same element can have different masses

Atoms of different elements combine in simple whole-number ratios

Atoms have a nucleus made of protons and neutrons

Atoms can be created or destroyed

Atoms are rearranged in chemical reactions but not changed

Atoms disappear after chemical reactions

Atoms change into new atoms during reactions

Oxygen and Magnesium

Fluorine and Neon

Carbon and Potassium

Helium and Lithium

High density

Conduct heat and electricity well

Form acidic oxides

Malleable and ductile

Elements with higher atomic mass are always gases

Elements with lower atomic mass are always liquids

Elements with similar atomic masses are in the same physical state

There is no direct relationship between atomic mass and physical state

Argon – gas at room temperature

Silver – shiny, good conductor of electricity

Gold – heavy, soft metal

Aluminium – light, strong metal

Atoms of different elements cannot combine

Compounds are made when atoms lose electrons

Compounds are made of atoms of different elements combined in fixed ratios

Compounds form when atoms merge into one

Sodium (Na) – 11

Carbon (C) – 6

Potassium (K) – 19

All of the above

A) Lead (Pb)

B) Sulfur (S)

C) Phosphorus (P)

D) Calcium (C)