What does below chemistry rebus means?

A sundial has the fewest moving parts of any timepiece. Which has the most?

Find the number of squares in the below picture

Which five letter word can be added at the end of below word to form a
valid word?

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What does man love more than life, hate more than death or mortal strife; That which contented men desire; the poor have, the rich require; the miser spends, the spendthrift saves, and all men carry to their graves?

Can you convert the number zero(0) into a positive number using just one mathematical operator ?

I am 5 letters long.
My first two tell you who I am
My first 3 could be a medicine
My last three reversed could be a young boy.
My 4th, 3rd and 2nd in that order could be a fruit drink.
If you have me you may hang me round your neck
WHAT AM I ?

The following four words might seem abrupt to you. But you can make them meaningful by just adding vowels.
RDSH
GGPLNT
TMT
NN

Hint: All of them are vegetables.

What is the riddle which can be asked all day with a different correct answer each time.

When I got four, I have it none.
When I got two, I have it some.
When I got none, I have it all.

What is it?