The process by which gas changes into solid.
deposition
The process by which particles move from an area of higher concentration to an area of lower cconcentration.
diffusion
It is the 7th group of elements.
Halogens
Which is the most reactive non-mental element.
Fluorine
Give 3 reasons why Francium is the most reactive element?
bigger size more shells, weaker electrostatic force, easy to donate valence electron
What does metallic bond have that other type of bonds doesn't have?
delocalized electrons
It is the positive ion.
Cation
What bond is in the molecule of water?
covalent bonds
When metals are bonded with non-metals, what type of bond is formed?
ionic bond
How many shells does Sodium (Na) has?
3
What is the electron configuration of Calcium (Ca)?
2,8,8,2
Give two reasons why Kr is unreactive.
it has full outermost shell. It is already stable, does not need to react.
Who proposed the "Plum Pudding Theory" of atom?
Joseph John (J.J.) Thomson
It has similar number of protons and electrons but different atomic mass.
Isotopes
What are valence electrons?
electrons at the outermost shell.
What metal ion produces lilac color flame?
Potassium (K)
