Atoms and Elements
What is the smallest building block of matter?
Atom
What is a pure substance made of?
Only one type of particle
Which particle has a positive charge?
Protons
Who created the first widely recognized periodic table?
Dmitri Mendeleev
Who proposed the Law of Octaves? (HINT: Initials JN)
John Newlands
An element is made up of how many types of atoms?
One
Can mixtures be physically separated?
Yes
Which particle has no charge?
Neutron
What are vertical columns called?
Groups
Who first proposed atomic theory in ancient Greece?
Democritus
What do we call atoms joined together?
Molecules
Is saltwater a pure substance or mixture?
Mixture
Which subatomic particle moves around the nucleus?
Electrons
Where are metals found on the periodic table?
Left and Centre
What did Mendeleev predict?
Properties and presence of undiscovered elements
Which part of the atom determines the element?
Number of Protons
Give one example of a homogeneous mixture.
Saltwater, Sugarwater
Which two particles contribute to the atomic mass?
Protons and Neutrons
Which group contains noble gases?
Group 18
Who identified element triads?
John Da'bereiner
What is the center of the atom called?
Nucleus
Give one example of a heterogeneous mixture.
Granite (Any substance where the mixture is not uniform throughout)
What does the atomic number represent?
Number of Protons
What do elements in the same group have in common?
Similar Chemical Properties
Which modern discovery confirmed Mendeleev's predictions?
Discovery of elements that fit in the gaps