WorksheetsAtoms
Total questions: 20
Worksheet time: 16mins
What is the timeline of the atoms
(a)
What did Democritus say?
Everything is composed of small atoms moving in a void
Atoms can neither be created nor destroyed
Idea was rejected because void = no existence
Plum Pudding Model
Discovered Isotopes
What did Dalton say?
Everything is made up of atoms
Atoms can neither be created nor destroyed
All atoms of a given element are identical
Elements are made up of extremely small particles called atoms
Plum Pudding
What did Thompson say?
Discovered Isotopes
Elements are made up of extremely small particles
Made the Plum Pudding Model
Made the Cathode Ray Model
Nucleus Theory
What did Rutherford say?
He said the center of the atoms is the Nucleus
Nucleus Theory
Atoms have positive charged particles in the center
Made Cathode Ray Model
Atoms mass is mainly in the nucleus
What did Bohr say?
Atoms are extremely small particles
Electrons move around the nucleus in specific layers, or shells
Atoms are made up of protons neutrons and electrons
Every atom has a specific number of electron shells
Quantum Energy Theory
What did Ernest and Werner say?
Electrons are particles and waves at the same time
Developed quantum numbers based on the theories of Einstein and Planck
Electrons are in probability zones called orbitals, and can not be pinpointed
Atoms are extremely small particles
Basic elements are made up of atoms
What did Chadwick say?
Neutrons are in the nucleus with protons
Neutrons are not in the nucleus with protons
Discovered particles with no charge
Atoms are small particles moving around in a void
He discovered Neutrons
What was the modern model
Electrons move around in the nucleus cloud
Impossible to pinpoint a electron
Work done since the 1920 has changed the model
All matter is made up of _____?
Air
Atoms
Mass
Blocks
Protons are ___
Neutrons ___
Electrons ___
+,N,-
-, N, +
-, +, N
N,-,+
If Protons and Neutrons are found in the nucleus then where are the electrons?
(a)
Atoms always have the same amount of _______ as _________
(a)
Atoms (a) have the same amount of neutrons as protons
What is a Isotope
(a)
Elements are building blocks of (a)
Electrons live in _____
Shells
Orbitals
Energy Levels
All of the Above
Shell 1 can hold _____ electrons
Shell 2 can hold _____ electrons
Shell 3 can hold _____ electrons
Shell 1 =8
Shell 2 =2
Shell 3 =18
Shell 1 =18
Shell 2 =2
Shell 3 =8
Shell 1 =2
Shell 2 =8
Shell 3 =18
Shell 1 =18
Shell 2 =8
Shell 3 =2
Electrons on the outer most shell are called what?
(a)
What are the four things on a element card?
(a)
