atomic structure

Question 1

what does the properties of chemicals depend on ? and what in particular ?

Answer 1

their atomic structure
particularly the arrangements of electrons around the nucleus

Question 1

why has our understanding of particles developed over the years ?

Answer 1

due to the developments of technology and new discoveries

Question 2

what does the nucleus of the atom contain ?

Answer 2

protons and neutrons

Question 3

where are the electrons located in the model of the atom ?

Answer 3

electrons orbit the nucleus in different energy levels

Question 4

how are neutrons and protons held together in the nucleus ?

Answer 4

they are held together by a strong nuclear force

Question 5

what kind of force hold the electrons in place ?

Answer 5

electrostatic forces of attraction

Question 6

which force is stronger electrostatic or nuclear ?

Answer 6

nuclear force is much stronger

Question 7

relative masses of subatomic particles ?

Answer 7

proton- 1
neutron- 1
electron- negligible

Question 8

relative charges of subatomic particles ?

Answer 8

proton- +1
neutron- 0
electron- -1

Question 9

what is meant by mass number (A) ?

Answer 9

the number/ sum of neutrons and protons in the nucleus of an atom

Question 10

what is meant by the atomic number (Z) ?

Answer 10

the number of protons (and electrons) in an atom