structure of an atom

Question 1

where are protons and neutrons found

Answer 1

nucleus

Question 2

where are the elctrons found

Answer 2

in the electron cloud

Question 3

what is the measured (kg) and relative mass of a proton

Answer 3

measured: 1.67x10 to the power of -27
relative: 1

Question 4

what is the measured (kg) and relative mass of a neutron

Answer 4

measured: 1.68x10 to the power of -27
relative: about 1

Question 5

what is the measured (kg) and relative mass of an electron

Answer 5

measured: 9.11x10 to the power of -31
relative: 1/2000

Question 6

what is the measured (C) and relative charge of a proton

Answer 6

measured: 1.6x10 to the power of -19
relative: +1

Question 7

what is the measured (C) and relative charge of a neutron

Answer 7

measured: 0
relative: 0

Question 8

what is the measured (C) and relative charge of an electron

Answer 8

measured: -1.6x10 to the power of -19
relative: -1

Question 9

4 facts about atoms

Answer 9

Neutral atoms have the same number of electrons as protons.

Atoms usually have about as many neutrons as protons.

Adding a proton makes a new kind of atom.

Adding a neutron makes an isotope of that atom, a heavier version of that atom.

Question 10

what are isotopes

Answer 10

isotopes are atoms with the same number of protons and a different number of neutrons

Question 11

what are isotopes named after

Answer 11

Isotopes are named by their mass number as they have a different mass (because of the different number of neutrons they contain)

Question 12

why are the atomic masses of most elements on the periodic table are not whole numbers.

Answer 12

because the masses are a weighted average of all the isotopes of that element