Chapter 4 Flashcards
The smallest particle of an element that retains its identity in a chemical reaction is an
Atom
The total number of protons and neutrons in the nucleus of an atom is the
Mass number
Positively charged subatomic particle is a
Proton
Negatively charged particle?
Electron
Subatomic particle with no charge?
Neutron
Adams with the same number of protons but different numbers of neutrons
Isotopes
1/12 the mass of a carbon-12 atom
Atomic mass unit
And arrangement of elements in which the elements are separated into groups based on a set of repeating properties
Periodic table
The weighted average of the mass of the Adams in a naturally occurring sample of an element
Atomic mass
Dalton’s atomic theory?
1) All matter is made of atoms. Atoms are indivisible and indestructible.
2) All atoms of a given element are identical in mass and properties.
3) Compounds are formed by a combination of two or more different kinds of atoms.
4) A chemical reaction is a rearrangement of atoms.
Democritus was the first to suggest?
That there are “atoms”
Atoms of one element can never change into atoms of another element. True or false?
True
Individuals atoms can be observed with?
Scanning microscopes
What is JJ Thompson accredited to?
The discovery of electrons and protons. “Plum pudding”
The horizontal row is called a
Period. properties vary as you move left to right
