Atoms & Elements Flashcards
What is the smallest part of an element that can exist?
Atom
On which part of the periodic table do you find non-metallic elements?
Right hand side
Group 1 in the periodic table is also known as
Alkali metals
Group 7 in the periodic table is also known as
Halogens
Helium, Neon, Argon and Krypton are found in group 0 and they are examples of
Noble gases
Define a molecule
A defined group of non-metal atoms that are chemically bonded
Define a compound
Two or more elements chemically bonded in a fixed ratio.
Potassium phosphate contains potassium, phosphorous and what else?
Oxygen
Define a mixture
Two or more elements or compounds are present without being chemically bonded together.
How does mass change in a chemical reaction?
It doesn’t. The total mass of reactants = total mass of products
Define a lattice
A regular three-dimensional arrangement of atoms (or ions) in a solid
What is the charge of an electron?
Negative
Which particles are found in the nucleus?
Protons and neutrons
Which two subatomic particles have the same mass?
Protons and neutrons
What does the atomic number tell us?
Number of protons. This determines the element.
