Mr. Brooks - Atomic Strucutre Flashcards
(21 cards)
What’s the smallest particle that an element keeps in a chemical reaction?
Atom
Whose the first to suggest the existence of atoms, and show that they were indivisible and indestructible?
Democritus
Who put Democritus’s ideas into a scientific theory by studying the ratios in which elements combine?
His theories include:
- All elements are composed of tiny paricles called atoms
- Atoms of the same element are identical
- Atoms of different elements can phyiscally and chemically mix together to form compounds
- Chemical reactions occur when atoms are separated, joined, or rearranged
John Dalton
What are atoms that are divisible called, and disproved a part of Dalton’s theory?
Subatomic particles
What are the 3 types of subatomic particles?
Electrons, protons, and neutrons
Who were electrons discovered by?
JJ Thompson
What are the charge of electrons?
Negative
Where are electrons found?
Electron cloud
What is the charge of protons?
Positive
Where are protons found?
Nucleus
What are sub atomic particles with no charge and a mass nearly equal to a proton?
Also found in the nucleus
Neutrons
Who suggested that atoms are mostly empty space?
- Also concluded that all postive chrage and all the mass on a atom are concentrated in a small region
Ernest Rutherford
Called the Atomic Model
What is the tiny central core of an atom and composed of neutrons and protons?
Nucleus
What’s type of atom has it where the electrons are distributed around the nucleus and occupy almost all of the volume?
Nuclear Atom
What’s the number of protons in the nucleus of an atom called?
Also indetifies an element
Atomic Number
What’s the total number of prtons and neutrons in an atom?
Mass number
What are atoms that have the same number of protons but different number of neutrons?
Isotoes
Isotopes of an element have different mass #’s, but same atomic #’s
What’s an elements weighted average mass of atoms in a natural sample of element?
Atomic Mass
What’s the arrangement of elements into groups based on a set of repeating properties?
- It allows you to compare properties of different elements
Periodic table
What’s each row of the perodic table called?
- There are 7 rows of the periodic table
Period
What’s each column of the periodic table called?
Group/ family
