IGCSE Atomic Structures

What is the nucleon number of an atom?

• The number of electrons, neutrons and protons in the nucleus.

• The number of neutrons and protons in the nucleus.

• The number of neutrons in the nucleus.

• The number of protons in the nucleus.

Which part of an atom has a relative mass of 1 and a relative charge of 0?

• electron

• neutron

• nucleus

• proton

In which atom is the number of protons equal to the number of neutrons?

• ⁴⁰Ar

• ¹⁹F

• ²³Na

• ¹⁶O

Which atom has an equal number of protons, neutrons and electrons?

• ⁴⁰Ar

• ¹H

• ²³Na

• ¹⁴N

Symbols representing four particles are shown.

(attached)

The letters are not the chemical symbols.

Which particles have the same number of neutrons?

• W and X²⁺

• W and Z

• X²⁺ and Y

• Y and Z

Iodine, I, has a lower relative atomic mass than tellurium, Te, but is placed after it in the Periodic Table.

(attached)

Which statement explains why iodine is placed after tellurium in the Periodic Table?

• Iodine has fewer neutrons than tellurium.

• Iodine has fewer protons than tellurium.

• Iodine gas more neutrons than tellurium.

• Iodine has more protons than tellurium.

The structure of an atom is shown.

(attached)

Which element is the atom an isotope of?

• Nitrogen

• Oxygen

• Phosphorus

• Titanium

An isotope of lithium has the symbol .

What is the arrangement of electrons in one atom of this isotope of lithium?

• 
• 
• 
• 

Which row gives the number of protons, electrons and neutrons found in an atom of zinc?

• p = 30

  e = 30

  n = 35

• p = 30

  e = 35

  n = 35

• p = 35

  e = 30

  n = 35

• p = 35

  e = 35

  n = 30

Element Q has 4 electrons in its outer shell and has 69 neutrons. Q conducts electricity.

What is Q?

• Carbon (C)

• Lead (Pb)

• Thalium (Tl)

• Tin (Sn)