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hi...I'm from India and am currently studying in first-year junior college.
Now, where I am stuck is that "it is observed that boiling points of hydrides decrease with the decrease of molecular weights with exception of , , and . Why is it so? Please explain?

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THANKS SO MUCH FOR ANY HELP


What element they are:

1.My appearance at standard state is a silvery-white. My density when I melt is 1.46g/cm3. I burn purple, and react violently on contact with water. I see use in atomic clocks, and sometimes in glass

2.I am a diatomic molecule with a melting point of -259.14˚C and have a lower density than any other element.I am highly flammable and commonly form compounds with non-metals and halogens.I am commonly found in a product used to clean wounds and am one of the main elements involved in making stars shine

3.I am Silver-White in colour and I am so reactive I must be stored in oil.You may find me colouring glass windows in a church or reacting with water or acids to form hydrogen gas.I also oxidize and produce a film which tarnishes my Silver-White skin and can be used with other metals to form alloys

4.My soluble compounds are toxic to mammals yet I am used in paint, I am a soft but highly reactive metal. I am used in medical imaging but I am non-radioactive.

5.I am a poor conductor of heat or electricity, and my boiling point is at 536F.I am used as a fertilizer for soil and I help extinguish fire from common combustible, liquid, gas and electricity.

6.I get my name from the greek word meaning “moon”.I have 6 natural isotopes.I am protective against mercury poisoning, and my salt is used to control dandruff

7.I am a solid crystal yellow at room temperature. My melting point is , and I don’t dissolve in water I react with most elements when heatedI am famous for burning in air and producing a blue flame.I prevent rubber materials from melting, as they get warmer. I am also used to treat acne

8.I am useful inside the body and outside the body I help heal wounds. My boiling point is 184 degrees and my name is derived from my colour. A crystalline solid that gives off a coloured gas on heating and can be found in most seaweed

9.My alloy will chill out cast iron and colour ceramics. I can strengthen lead or make acids more corrosive. Some of my amino acids are fun guys but can be harmful in large groups.

10.I'm part of the p block, my standard state is a solid.
I'm a post transition metal, I'm silvery white in colour.
When evaporated i can produce a mirror as reflective as silver, my name means violet.

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