Question

which of these metals is radioactive?

Answer 1

what are the options???

Answer 2

rubidium..................francium....................potassium..............lithium

Answer 3

francium.it is..
it comes last in the group 1 (alkali metal group)
it is a heavy atom.

radioactivity is shown by heavy atoms.

Answer 4

is there any difficulty??

Answer 5

thanks

Answer 6

Alkali metals react with sulphur to form ..................types of sulphides

Answer 7

2.....................3...........4...................5

Answer 8

are u there

Answer 9

they form M2S type of sulhides...

apologies for late reply.

Answer 10

is it helpful??

Answer 11

what is the answer

Answer 12

2..............3................4...............5
what does this mean???

Answer 13

Alkali metals react with sulphur to form ..................types of sulphides
2.....................3...........4...................5

Answer 14

i am still not able to comprehend what is asked in the question. do you want me to fill the blank i.e. form ...................types
by either 2 or 3 or 4 or 5??????????????

is this the question??

what i told in the previous answer as the stoiciometry of the sulfide formed by reacting the alkali metal say M with sulphur S,
the stoiciometry of the sulfide produced is \[M _{2}S \]

Answer 15

the answer can be 2

eg lLITHIUM WILL FORM THE SULPHIDE LI2S

Answer 16

that is the option there

Answer 17

mm... yes.. 2 is there in the options....
that is the correct answer...........according to me.

Answer 18

I THOUGHT AS MUCH THANKS