M2 ,, Atomic Structure And Isotopes

Question 1

Define an isotope?

Answer 1

Isotopes are atoms of the same element with different numbers of neutrons and same number of protons

Question 2

Define mass number?

Answer 2

Total number of protons and neutrons in the nucleus
(Usually the bigger number)

Question 3

Define the atomic number?

Answer 3

Number of protons/electrons in nucleus
Usually smaller number

Question 4

Properties of particles found in atoms?

Answer 4

Current model of the atom consists of protons and neutrons in a dense nucleus and electron around nucleus in shells.

Question 5

Define relative isotopic mass?

Answer 5

Mass of an atom of the isotope compared with 1/12th of the mass of an atom of carbon-12

Question 6

Define relative molecular mass (Mr)?

Answer 6

Average mass of a molecule compared to 1/12th of the mass of one atom of carbon-12

Question 7

Define relative atomic mass?

Answer 7

weighted mean mass of all isotopes of the element compared with 1/12th of the mass of an atom of carbon-12

Question 8

Define relative formula mass?

Answer 8

Refers to substances with giant structures
Sum of atomic masses of all the atoms in the formula of the substance

Question 9

Why do isotopes have similar chemical properties?

Answer 9

Cuz the have the same electronic structure
The may have slightly varying physical properties due to different masses

Question 10

Relative atomic mass formula

Answer 10

= ( isotopic mass x abundance% ) + ( I x A% ) / 100