Chemistry Chapter 2

What is the number of electrons?

• 13

• 14

• 26.98

• 27

What is the atomic number?

• 14

• 27

• 26.98

• 13

What is the atomic number?

• 24.31

• 24

• 13

• 12

What is the atomic number of Neon, Ne?

• 10
• 20.1798
• 10.1798
• 7

A neutral atom of the isotope ²⁶₁₂Mg would consist of

• 12 protons, 26 neutrons, 26 electrons
• 26 protons, 12 neutrons, 26 electrons
• 26 protons, 14 neutrons, 14 electrons
• 12 protons, 14 neutrons, 12 electrons

Which of the following statements regarding subatomic particles is incorrect?

• Protons are positively charged particles and neutrons have no charge.
• The relative mass of the proton, electron and neutron the same.
• In a neutral atom the number of protons equals the number of electrons.
• Isotopes of an element have the same number of protons but a different number of neutrons.

Isotopes of the same element have the same number of 

• protons
• neutrons
• electrons
• not enough information

Iron-60 (atomic number 26) is an isotope that is often used to study meteorites.  How many neutrons does iron-60 have?

• 26
• 60
• 34
• 86

Which of the following particle pairs has approximately the same mass?

• protons and neutrons
• protons and electrons
• neutrons and electrons
• protons, neutrons and electrons

A carbon isotope consists of 6 protons, 6 electrons and 8 neutrons.  What is the mass number for this isotope?

• 12
• 14
• 6
• 8