atomic structure

Question 1

structure of an atom

Answer 1

nucleus with protons and neutrons, surrounded by electrons arranged in shells

Question 2

relative charge and mass of a proton

Answer 2

charge: +1
mass: +1

Question 3

relative charge and mass of a neutron

Answer 3

charge: 0
mass: +1

Question 4

relative charge and mass of an electron

Answer 4

charge: -1
mass: 0.00055

Question 5

atomic mass number definition

Answer 5

total relative mass of an atom or ion (number of protons and neutrons)

Question 6

how big is the nucleus of an atom compared to the overall atom size

Answer 6

very small

Question 7

where does most of the mass come from in an atom

Answer 7

most atomic mass is concentrated to the nucleus

Question 8

atom isotope definition

Answer 8

different atoms of the same element containing the same number of protons but different numbers of neutrons

Question 9

relative atomic mass equation

Answer 9

((relative mass 1 * abundance 1) + (relative mass 2 * abundance 2)) / 100

Question 10

how does the existence of isotopes result in atomic masses sometimes not being whole numbers

Answer 10

because they are a weighted average of the mass numbers of the different isotopes of that element, with respect to their abundances in nature

Question 11

atom definition

Answer 11

the smallest particle of a chemical element that can exist