When sodium atom form the ion Na⁺,

A. it gains one proton

B. it achieves a noble gas configuration

C. its atomic number increases

D. it gains one electron

Which of the following statements about rare gases are correct?

A. Their outermost shells are fully filled

B. They are generally unreactive

C. Their outermost shells are partially filled

D. They have lone pair of

Which of the following properties is characteristic of the halogens?

A. Ability to accept electrons readily

B. Ability to donate electrons readily

C. Ability to from basic oxides

D. Formation of coloured compounds

In which of the following atoms is the ionic radius larger than the atomic radius? [₁₁ Na, ₁₂Mg,₁₃AI,₁₇CI]

A. Aluminium

B. Chlorine

C. Magnesium

D. Sodium

A transition metal would be expected to

A. from oxides with different formulae

B. have strong oxidizing ability

C. have low density

D. have an atomic structure with an incomplete outermost shell

Which of the following properties of atoms generally increases down a group in the periodic table?

A. Electron affinity

B. Electronegativity

C. Ionic radius

D. lonization energy

Which of the following statements about sodium is not true?

A. Na⁺ is smaller in size than Na

B. Na is smaller in size than Na⁺

C. Na⁺ has fewer electrons than Na

D. The effective nuclear charge in Na⁺ is greater than in Na

If the difference between the electronegativities of two elements is large, the type of bond that can be formed between them is

A. covalent

B. dative

C. ionic

D. metallic