The Guys behind it all
Who proposed the philosopical idea of atoms?
Democritus
The number of protons in an atom of an element is its
What is : atomic number
Neutron is _______ charged
What is : uncharged/ neutral
What two particles make up the net charge of an atom nucleus?
What is : protons and electrons
When atoms joins together forms
A molecule
What structure did Rutherford discover was in an atom after his gold foil experiment?
What is : A nucleus
The positively charged particle
What is : A proton
Electrons are _____ charged.
negatively
What particle lives in the rings in the Bohr diagram?
electrons
What is the atomic number of Hydrogen
1
Who proposed the first scientific theory of atoms?
John Dalton.
Democritus proposed the idea tiny, indivisible particles (atomos) existed, but his was more philosphical, rather than a a scientific atomic theory.
Most of the mass of an atom is concentrated in _________.
What is : the nucleus
Everything you can touch, see, taste or smell is made of?
Matter
Tell me the symbolic letter of the element Krypton
Kr
Tell me the Symbolic letters for Tantalum
Ta
Atoms are made up of:
Subatomic particles: Electrons, protons and neutrons
In an atom, which has the least mass? A: nucleus B: proton C: neutron D: electron
electron
The atomic number tells us
The number of protons
The large, empty space surrounding the nucleus where electrons travel
Electron cloud; shells, energy levels
Tell me the atomic number of Phosphorus
15
Two of JJ Thomson‘s famous contributions to atomic studies were:
1) the discovery of the electron and 2) the proposal of the plum pudding model.
Describe the difference between atomic number and mass number *Multiple sentence answer*
What is : The atomic number is the number of proton in an atom. The Mass number is the sum of the number of protons and neutrons in an atom of a particular isotope
The most dense structure in an atom called _______ is made up of ______ and ______.
What is : the nucleus, protons, and neutrons
The number or protons and electrons are the same? T or F
true
Tell me the atomic number of Xenon and its symbolic letters
Xe and 54