5 Questions
What determines whether an element is stable or reactive?
The number of electrons in the outer shell
Why are molecules of the same compound held together?
Cohesive forces
What is the mass relationship between a proton and a neutron?
A neutron is the same mass as a proton
If an element has 7 electrons in its outer shell, what is its valency?
6
How does a catalyst affect chemical reactions?
Speed up reactions
Test your knowledge on matter with this quiz focusing on atoms and mass numbers. Learn about valency and how to determine the mass number of an element.
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