1 and 2 1) The first ionization energies of elements generally from left to righ

Question

1 and 2

1) The first ionization energies of elements generally from left to right across a period of the periodic table, and generally from bottom to top of a group. A) increase, increase B) increase, decrease C) decrease, increase D) decrease, decrease E) are completely unpredictable 2) Of the following, which gives the correct order of changes in atomic radius for Period 3' elements ) Mg. Na, P, Si and Ar? A) Ar > Si >P>Na Mg B) Mg > NaP Si Ar C) Si P Ar Na Mg D) Na Mg Si P Ar E) Ar P Si Mg > Na

Explanation / Answer

1)

1st ionisation energy decreases as we move from top to bottom in periodic table. This is due to the increasing size

1st ionisation energy increases as we move from left to right in periodic table. This is due to the decreasing size

Answer: A

2)

Atomic radius decreases as we move from left to right in periodic table.

here from left to right elements are:

Na Mg Si P Ar

So, size is:

Na > Mg > Si > P > Ar

Answer: D

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