Answer:
The electrons of an atom that can participate in the formation of chemical bonds with other atoms.
Valence electrons are located on the outermost energy level and determine how reactive an atom will be
Explanation:
the force of attraction towards the centre
of earth or planet is gravity.
for example
- rock in land
- flow of river downwards
- revolution of earth towards the sun
Answer:
A. to cure human diseases
Explanation: