Lesson 3: Electrons and Chemical bonding Flashcards
1
Q
how do atoms join together?
A
By chemical bonds
2
Q
What happens to atoms during
chemical changes?
A
They get rearranged
3
Q
What are valence electrons?
A
They are the electrons in the outermost energy level of an atom.
4
Q
How does the periodic table show the
number of valence electrons?
A
An element’s group number (vertical top to bottom) is the number of valence electrons it has and the period number (horizontal left to right) is the number of energy levels of an element.
5
Q
Why do atoms form bonds?
A
So the outermost energy level of an atom is full (2 or 8 depending on the element)
