Topic 3 Chem Periodic Table Questions

Which statements about atomic structure and the periodic table are correct?

I. An element in group 2 has 2 electrons in its valence (outer) energy level.

II. An element in period 3 has electrons in 3 energy levels.

III. The element in group 2 and period 3 has an atomic number of 12.

• I and II only

• I and III only

• II and III only

• I, II and III

An element is in group 4 and period 3 of the periodic table. How many electrons are in the highest occupied energy level of an atom of this element?

• 3

• 4

• 12

• 14

Which property shows a general increase from left to right across period 2, Li to F?

• Melting point

• Electronegativity

• Ionic radius

• Electrical conductivity

What are typical characteristics of metals?

• A

• B

• C

• D

How do the following properties change down Group 17 of the periodic table?

• A

• B

• C

• D

Which series represents atoms in order of decreasing atomic radius?

• N > C > Be > Mg

• Mg > N > C > Be

• Be > C > N > Mg

• Mg > Be > C > N

Which oxides produce an acidic solution when added to water?

I. Al₂O₃ and SiO₂

II. P₄O₆ and P₄O₁₀

III. NO₂ and SO₂

• I and II only

• I and III only

• II and III only

• I, II and III

Which species will require the least energy for the removal of one electron?

• Na⁺

• Mg⁺

• Al²⁺

• C³⁺

Which describes the oxide of sodium, Na₂O?

• A

• B

• C

• D

Which statement is correct?

• Atomic radius decreases down group 17.

• First ionization energy decreases down group 1.

• Atomic radius increases across period 3 from Na to Cl.

• First ionization energy decreases across period 3 from Na to Cl.