The Nature Of Matter Flashcards
What is the basic unit of MATTER?
atom
What three subatomic particles make up an atom?
protons, neutrons, and electrons
What charge are protons?
positive
What charge are neutrons?
no charge
What charge are electrons?
negative
What forms an atoms nucleus
protons and neutrons
Where in the atom are electrons?
Electrons are in constant motion in the space surrounding the nucleus.
What charge are atoms?
neutral
What is an element?
A pure substance that consists entirely of one type of atom.
How are isotopes of an element similar?
They all have the same number of electrons giving them the same chemical properties.
What is an isotope?
Atoms of the same element that differ in the number of protons and neutrons they contain
What is a radioactive isotope?
An isotope that’s nuclei are unstable and break down at a constant rate over time
In what ways do compounds differ from their component elements?
Physical and chemical properties of a compound are usually very different from those of the elements from which it is formed.
What is a chemical compound?
A substance formed by the chemical combinations of two or more elements in definite proportions
How is the chemical formula written for the compound water
H2O
