PART $1$

is the apparafus to measare the atmospheric pressufe$-$

Group $7$A elencnts are also callod$-$

ativit mactais

b$)$ alkaline carth metils

c$)$ halogcns

d$)$ noble gases

c$)$ nonc of the above

How many protons and electrons are present in oxide $(O^{-2})$ ion?

a$)8$ electrons and $8$ protons

b$)8$ clectrons and $10$ protons

c$)10$ electrons and $8$ protons

d$)8$ electrons and $16$ protons

e$)$ none of the above

Which of the following amounts of gases occupies the highest volume?

a$)lg$ of $O_2$

b$)lg$ of $Kr.$

c$)1g$ or $H_2$

d$)lg$ of $N_2$

Part $2$

You have $10\mathrm{.}0g$ euch of $Na,Ca,C,Pb$ and Ne$.$ Which contains the largest number of moles? Show your calculations.

a$)Na$

b$)Cu$

c$)C$

d$)Pb$

c$)$ Ne

Which of the following stafements about cations are true?

Cations are formed when atoms loose clectrons

b$.$ cations camy a positive charge

c$.$ cations have atomic mass les than their atom

d$.$ cations have same number of protons and clectrons

$2$