Question

1) The formula of silver I chloride is _____ [ AgCl / AgCl₂ ]

2) The basic unit of an element is a/an _____ [ molecule / atom / ion ]

3) Atom contains _____ [ netron/nucleus ] with positively charged ________ [ electrons / protons ]

4) Element _______ [ calcium / lead / carbon ] has the symbol derived from its latin name 'plumbum'.

5) From the elements - He, Br, Pt, & O; the element which forms a polyatomic molecule is _____ & which is liquid at room temperature is ____.​

Answer 1

AnswEr :

1) The formula of silver I chloride is AgCl.

2) The basic unit of an element is an atom.

3) Atom contains nucleus with positively charged protons.

4) Element lead has the symbol derived from its latin name 'plumbum'.

5) From the elements - He, Br, Pt, & O; the element which forms a polyatomic molecule is O & which is liquid at room temperature is Br.

￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣

Answer 2

Answer:

1. AgCl
2. atom
3. nucleus, protons
4. lead
5. Oxygen forms polyatomic molecules like carbonate, sulphate etc and bromine is a liquid element.