Atomic Structure & the Periodic Table

Which of the following has only five electrons in its valence shell

• Lithium

• Nitrogen

• Oxygen

• Fluorine

Which of the following has the smallest atomic radius

• Lithium

• Nitrogen

• Oxygen

• Fluorine

Tags

NGSS.HS-PS1-1

Which of the following has the greatest ease of ionisation?

• Lithium

• Magnesium

• Aluminium

• Potassium

Which of the following elements has the largest ionic radius?

• Cl^-

• S^2-

• K⁺

• Ca²⁺

Which of the following statements is true?

• All atoms of a given element contain the same number of neutrons

• Chemical reactions cannot change the nuclear composition of atoms

• John Dalton discovered the first subatomic particle

• Isotopes and isomers are the same thing

A sample of an element X was analysed and was found to consist of four isotopes of mass and relative abundance as shown in the table below. Calculate the relative molar mass of element X.

• 15.61

• 16.75

• 15.50

• 17.00

Which of the following statements about radioactivity is not true?

• The ratio of neutrons to protons in an atom’s nucleus determines the stability of the nucleus.

• X-rays and γ-rays are essentially the same.

• Electrons are destroyed in nuclear reactions.

• Radioactive isotopes are used in smoke detectors.

Which of the following elements is a liquid at room temperature and pressure?

• Helium

• Mercury

• Silicon

• Copper

Which of the following elements is most electronegative?

• Carbon

• Nitrogen

• Oxygen

• Fluorine

Top of form radioactive decay from an isotope of which of the following elements is used to determine the appropriate age of ancient artifacts

• H

• U

• N

• C