Question

The following question refers to the periodic table :

i) Name the first and the last element in period 3

ii) What happens to the atomic size of elements moving from left to right across a

period?

iii) The atomic number of phosphorus is 15. Write the chemical formula of the

compound formed with chloride.

iv) Compare the metallic character across the period.

v) Name the first two members of halogen family.

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Answer 1

Answer:

Boron and thallium

increase

Pcl4

atomic number increase and the mass also increases

Helium and Neon

Explanation:

this is the anwer check it is correct