3.1 Electron Theory Flashcards
A neutron has.
A. the opposite charge to an Electron but half the weight of a proton.
B. the same charge as an Electron but half the mass. C. no electrical charge but will add weight to the nucleus
No electrical charge but will add weight to the neucleus
The unit which consists of two or more different types of atoms is known as a.
A. particle of an element.
B. molecule of a compound.
C. molecule of an element
Molecule of an compound
In what equipment is a photon radiated when an electron leaves a hole?.
A. Photo-cell.
B. LED.
C. Photo diode
LED
A good electrical insulating material will contain.
A. Only a small number of electrons in the outer shell of each atom of the material.
B. strongly bound electrons in the atoms of the material.
C. Weakly bound ‘free’ electrons in the atoms of the material
Strongly bound electrons in the atoms of the material
The smallest particle that a substance can be split and show the same properties as the whole is known as.
A. an Element.
B. a Molecule.
C. an Atom
Atom
What charge does the nucleus of an atom possess?.
A. Positive.
B. Neutral.
C. Negative.
Positive
What is the maximum number of electrons in shell N of an atom?.
A. 18.
B. 32.
C. 16.
32
Shell k = 2 electrons, shell L= 8 electrons, shell M = 18 electrons and shell N = 32 electrons
An oxygen molecule is made up of
A. two oxygen atoms sharing neutrons.
B. two oxygen atoms sharing protons.
C. two oxygen atoms sharing electrons
Two oxygen atoms sharing neutrons
If electrons are added to an atom it becomes.
A. a neutral ion.
B. a positive ion.
C. a negative ion.
Negative ion
An element whose atoms have fewer than 4 electrons in their valency shell are.
A. semiconductors.
B. good insulators.
C. good conductors
Good conductors
The charge on a proton is.
A. positive.
B. negative.
C. neutral
Positive
What effect do the electrons of one atom have upon the electrons of another atom?.
Option A. They have no effect on each other.
Option B. They repel each other.
Option C. They attract each other
They repel each other
What is a molecule?.
Option A. The smallest part of an atom.
Option B. The smallest part of a compound.
Option C. The smallest part of an electron
Smallest part of a compound
An atom is.
Option A. the smallest part of an element that retains its characteristics.
Option B. the smallest part of a compound that can exist independently.
Option C. the smallest particle of matter
the smallest part of an element that retains its characteristics
A neutron is a particle which is.
Option A. is contained in the nucleus of all atoms.
Option B. orbits the nucleus of the atom.
Option C. is contained within the nucleus of most atoms
Is contained within the nucleus of most atoms
The mass of an atom is contained mainly in the.
Option A. proton.
Option B. nucleus.
Option C. electron
Nucleus
When an atom loses or gains an electron it is called.
Option A. a molecule.
Option B. a current.
Option C. an ion
An ion
A good electrical insulator is a material which.
Option A. contains a large number of positive ions.
Option B. has its electrons tightly bound to their parent atoms.
Option C. has more protons than electrons
Has it’s electrons tightly bound to its parent atoms
An electric current is.
Option A. an ordered flow of electrons.
Option B. a surplus of free electron.
Option C. an excitement of electrons in a metal
An ordered flow of electrons
An atom contains.
Option A. hydrogen.
Option B. molecules.
Option C. electrons
Electrons
Germanium and silicon have how many electrons in their outer shell?.
Option A. 6.
Option B. 4.
Option C. 2
4
All semiconductors (including carbon) have 4 electrons in their outer shell
If a free electron is given to another atom, that atom is a.
Option A. valency atom.
Option B. negative ion.
Option C. positive ion
Negative ion
The atomic number of an atom is determined by the number of.
Option A. protons.
Option B. electrons.
Option C. neutrons
Protons
The valence electron is.
Option A. the electron in outer shell of atom.
Option B. the electron in inner shell of atom.
Option C. a positive electron
The electron in the outer shell of an atom
An atom with a deficiency in electrons has.
Option A. low resistance.
Option B. high resistance.
Option C. high impedance
Low resistance
An atom with less than 4 electrons in its outer shell has.
Option A. low electrical resistance.
Option B. no electrical resistance.
Option C. high electrical resistance
Low electrical resistance
Elements such as phosphorus with 5 electrons in their outer shell, when combined with pure silicon, is a.
Option A. isotopic.
Option B. acceptor.
Option C. donor
Donor
An hydrogen atom consist of a.
Option A. Proton, Neutron and an Electron.
Option B. Proton and an Electron only.
Option C. Neutron and a proton only
Proton and Electron only
For an atom to become a negative ion it must.
Option A. gain at least one electron.
Option B. have undergone ionisation by the sun.
Option C. lose at least one electron
Gain at least one electron
What is the maximum number of electrons in shell M of an atom?.
Option A. 18.
Option B. 6.
Option C. 16
18
A neutral atom with an atomic no. of 3 has how many electrons?.
Option A. 1.
Option B. 3.
Option C. Dependant on type of atom
3
The nucleus of an atom is.
Option A. neutral.
Option B. positive charged.
Option C. negative charged
Positive charged
Electron orbits are called.
Option A. waves.
Option B. shells.
Option C. valences
Shells
A neutral atom gains electrons.
Option A. It gains a positive charge.
Option B. It gains a negative charge.
Option C. It remains neutral
It gains negative charge
An oxygen atom has.
Option A. protons and electrons.
Option B. neutrons and protons.
Option C. protons, neutrons and electrons
Protons, neutrons and Electrons
