Judge these atom and isotope lines

Exercise and reference answers

Questions

1. Statement is true

   Yes

   Statement

   Atomic number equals the number of protons in the nucleus.

2. Statement is true

   Yes

   Statement

   Isotopes of an element have different numbers of neutrons.

3. Statement is true

   No

   Statement

   The mass of an electron is roughly equal to that of a proton.

4. Statement is true

   No

   Statement

   Cathode rays travel from anode to cathode.

Instructions

Tap true or false for each line about protons, isotopes and cathode rays.