A simple model of the atom, symbols, relative atomic mass, electronic charge and isotopes

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46

Question 13

Medium

Describe the "plum pudding" model of the atom, detailing how charge and mass were thought to be distributed.

[2]

Write the three subatomic particles (electrons, neutrons, and protons) in chronological order of their discovery, from earliest to latest.

[2]

The discovery of isotopes explained why measured relative atomic masses of elements are often not whole numbers.

Naturally occurring antimony consists of two stable isotopes, $121Sb^{121}\text{Sb}$ and $123Sb^{123}\text{Sb}$ . The table below shows the mass numbers and percentage abundances of these two isotopes.

Isotope	Mass number	Percentage abundance (%)
$121Sb^{121}\text{Sb}$	121	57.2
$123Sb^{123}\text{Sb}$	123	42.8

Calculate the relative atomic mass ( $A_r$ ) of antimony. Give your answer to 1 decimal place.

[3]

A simple model of the atom, symbols, relative atomic mass, electronic charge and isotopes

Question 13

A simple model of the atom, symbols, relative atomic mass, electronic charge and isotopes Questions

A simple model of the atom, symbols, relative atomic mass, electronic charge and isotopes

Question 13

A simple model of the atom, symbols, relative atomic mass, electronic charge and isotopes Questions