Atoms And Elements Flashcards
What charge do neutrons have?
Neutrons have no charge they are neutral.
What charge do protons and electrons have?
Protons and electrons are electrically charged.
What is the relative charge of protons?
+1
What is the relative charge of electrons?
-1
What is an element?
An element is a substance that is made of only one sort of atom
How many elements are there?
There about about 100 different elements
What are the horizontal rows in the periodic table called?
Periods
What are the vertical columns in the periodic table called?
Groups
Where are the metals shown on the periodic table?
On the left. Most of the elements are metals.
Where are the non-metals shown on the periodic table?
On the right of the dividing line.
What are all substances made from?
All substances are made from tiny particles called atoms.
What is the number of electrons in an atom equal to?
The number of particles in its nucleus. This means atoms have no overall electrical charge.
What is the mass number of an atom?
The total number of protons and neutrons it contains. The mass number of an atom is never smaller than the atomic number.
What do atoms consist of?
Atoms consist of electrons surrounding a nucleus that contains protons and neutrons?
