science (atoms and periodic table) Flashcards
(13 cards)
what is an atom?
The atom is the smallest particle of a chemical element that can exist.
what is element?
When a substance is made up of one type of atom
What is molecules?
two or more atoms connected by chemical bonds
What is compound?
2 or more types of atoms are joined together by bonds
What does the atomic numbers tell us about atoms?
How many protons they have
What does mass numbers tell us about atoms?
How many protons and neutrons they have
What is cation?
A positively charged ion that lost electrons
What is anion?
A negative charged ion that has gained electrons
Where are the groups?
Groups are vertical columns (down) the table
Where are the periods?
Periods are horizontal rows (across) the periodic table
Ions are what type of atoms?
Ions are atoms that have a charge (can be positive or negative)
Bohr model diagrams
Shells: 2 (first), 8 (second), 8 (third)…
How to see the difference in 2 same-element isotopes
Neutrons
