) Before volume of liquid 'H' was measured, the pupils made sure that the measuring cylinder was clean and dry. State one reason for this
precaution
[1]
Total = 6 marks​

Adozen is 12, and your needing to calculate the weight of one medium egg, so i would do 21/12=1.75 per egg, and check your answer by doing 1.75 * 12= 21 : ) : ): ): ): ) i hoped i

☆ionisation energy increases across a period from na -> ar☆ionisation energy decreases down a group from li -> fr☆ionic radius decreases across a period from na -> cl☆ionic radius increases down a groupfrom f -> ii hope it clarifies your doubts

Here is the link to the all information u need i mean answer key