periodic table

Question 1

group

Answer 1

valence electron

Question 2

period

Answer 2

orbitals

Question 3

group 1

Answer 3

alkili metal

Soft, light metals that melt at low temperatures
Excellent conductors
Highly reactive with water and air
Found combined with other elements (never found as free elements)

Question 4

group 2

Answer 4

alkaline earth metals

Grey, metallic solids that are excellent conductors
Also reactive with air and water, but less vigorously than alkali metals
Melting points are higher than alkali metals

Question 5

group 7

Answer 5

halogen

Very reactive (in nature they exist only in combined states) Toxic and corrosive
Form salts when combined with alkali metals
Form strong acids in combination with Hydrogen

Question 6

group 8

Answer 6

noble gases

Lack of chemical reactivity as they have full outer shell of electrons
Do not form compounds with other elements under normal conditions ordinary conditions

Question 7

atomic number=

Answer 7

protons

Question 8

Electrical charge

Answer 8

is a property of protons and electrons.
protons are positively charged (+);
electrons are negatively charged(-);