Which of the following equations represents beta decay?

A. \(\frac{14}{7}\)N + \(\frac{4}{2}\)He → \(\frac{8}{17}\)O + \(\frac{1}{1}\)H

B. \(\frac{8238}{92}\)U → \(\frac{234}{90}\)Th + \(\frac{4}{2}\)He

C. \(\frac{8238}{92}\)U → \(\frac{239}{93}\)Np + \(\frac{0}{-1}\)e

D. \(\frac{13}{7}\)N + \(\frac{4}{2}\)He → \(\frac{16}{8}\)O + \(\frac{1}{1}\)H

The energy change which accompanies the addition of an electron to a gaseous atom is

A. atomization

B. electron affinity

C. electronegativity

D. ionization

Which of the following elements is a d-block element?

A. Calcium

B. lron

C. Lithium

D. Silicon

Which of the following statements about chlorine and iodine at room temperature is correct?

A. Chlorine is gas and iodine is solid

B. Chlorine is liquid and iodine is gas

C. Chlorine and iodine are gases

D. Chlorine is solid and iodine is liquid

If X is a group lll element, its oxide would be represented as

A. X₃O₂

B. X₃O

C. X₂O₃

D. XO₃

Which of the following species correctly represented an ion of M with 13 protons and 10 electrons?

A. ₁₀M ³⁺

B. ₁₀M ^3-

C. ₁₃M ³⁺

D. ₁₃M ^3-

A solid substance with high melting and boiling points is likely to be a/an

A. covalent compound

B. dative covalent compound

C. electrovalent compound

D. non-metal

Which of the following molecules has a linear shape?

A. CH₄

B. CO ₂

C. H₂S

D. NH ₃