Число протонов: Mg +12 ; Cu+29 Число нейронов: Mg -12 Cu -34 Число протонов соответствует порядковому номеру. Число нейтронов по формуле- (Ar-Z) A- относительная атомная масса, z- порядковый номер.
Boys: - aren't clever as girls - bully other children - are better at sport than girls - never gossip about their friends - often fight with each other - often hurt girls - don't care about what they look like - often call girls names and tease Girls: -are much better at maths -are much helpful at home than boys -often quarrel with each other -always boast about new things they have bought - get on well with each other You can always trust both them :)
Boys: - aren't clever as girls - bully other children - are better at sport than girls - never gossip about their friends - often fight with each other - often hurt girls - don't care about what they look like - often call girls names and tease Girls: -are much better at maths -are much helpful at home than boys -often quarrel with each other -always boast about new things they have bought - get on well with each other You can always trust both them :)
Число нейронов: Mg -12 Cu -34
Число протонов соответствует порядковому номеру. Число нейтронов по формуле- (Ar-Z) A- относительная атомная масса, z- порядковый номер.