C1.1-C1.7
Relative charge of proton
+1
Relative charge of electron
-1
An atom of an element always contains...
...equal numbers of protons and electrons
Relative charge of neutron
0
Relative mass of neutron
1
Relative mass of proton
1
A normal sample of chlorine contains only chlorine-35 and chlorine-37 atoms. Explain why the relative atomic mass of chlorine is 35.5.
1) average (mass of atoms/isotopes present) 2) more chlorine-35 than chlorine-37 / higher {percentage / abundance} of Cl-35 / lower {percentage / abundance} of Cl37 / (1)
Relative mass of electron
1/1837
State the total number of atoms in the formula: Al(NO3)3 (aluminium nitrate)
13 atoms
What is the most likely formula for aluminium nitride?
AlN
Choose the symbol which is in group 2 of the periodic table: Ca Cl K N Ne O
Ca (calcium)
Chlorine has an atomic number of 17. Chlorine-35 and chlorine-37 are two isotopes of chlorine. Name the number of neutrons in chlorine-35 and chlorine-37.
Chlorine-35= 17 Chlorine-37= 17
Chlorine has an atomic number of 17. Chlorine-35 and chlorine-37 are two isotopes of chlorine. Name the number of protons in chlorine-35 and chlorine-37.
Chlorine-35= 17 Chlorine-37= 17
Chlorine has an atomic number of 17. Chlorine-35 and chlorine-37 are two isotopes of chlorine. Name the number of electrons in chlorine-35 and chlorine-37.
Chlorine-35= 18 Chlorine-37= 20
Position of neutron in atom
In nucleus
Position of proton in atom
In nucleus
Position of electron in atom
In shells
Choose the symbol readily forms an ion with a charge of -2: Ca Cl K N Ne O
O (oxygen)