Atom Structure & Periodic Table Flashcards
What is the meaning of atomic number?
The number of protons in the nucleus of an atom.
What is the meaning of electron?
A tiny particle with a negative charge and very little mass
What is the meaning of electron shell?
Areas around a nucleus that can be occupied by electron
What is the meaning of group?
A vertical column of elements in the periodic table
What is the meaning of isotope?
Atoms of an element with the same number of protons but different mass numbers due to different numbers of neutrons.
What is the meaning of mass number?
The total number of protons and neutrons in the the nucleus of an atom.
What is the meaning of neutron?
A particle found in the nucleus of an atom having zero charge and mass of 1
What is the meaning of period?
Rows of the periodic table
What is the meaning of proton?
A particle found in the nucleus of an atom, having a positive charge and the same mass as a neutron.
What is the meaning of subatomic particle?
A particle that is smaller than an atom, such as a proton, neutron or electron.
What is the relative atomic mass of an atom that contains 12 protons, 14 neutron and 12 electrons?
26
Sodium contains 11 electrons. What is the electronic structure of sodium?
2, 8, 1
Which of these is an element?
O2
CO2
O
O
Properties of metals
Good conductors
High melting and boiling points
All except 1 are solids
What is the maximum number of electrons that can be in the inner shell?
2
Name the three isotopes of hydrogen
Protium
Tritium
Deuterium
Which isotope of hydrogen is the most common?
Protium
How many neutrons does deuterium have?
1
What term is given to a specific nucleus that contains a certain number of protons and neutrons?
Nuclide
How many subatomic particles are there?
3
Types of subatomic particles
Neutron
Electron
Proton
What was the first English physicist called who discovered electrons in 1897?
JJ Thomson
What was the name of the atomic model devised by JJ Thomson?
Plum Pudding Model
Who was the physicist in 500 B.C, and what was his theory?
Demoncritus
Atoms make up everything
Who was the physicist in 1800’s and what was his theory?
John Dalton
Atoms are spheres
What was JJ Thomson’s theory?
Atoms contain positive charge
Who was the physicist in 1909 and what was his theory?
Ernest Rutherford
Alpha particles could bounce back off atoms
Who was the physicist in 1913 and what was his theory?
Niels Bohr
Electrons orbit the nucleus in the shells
What conclusions did Ernest Rutherford draw from his discovery?
Nucleus contains positively charged particles
Who was the physicist in 1913 and what was his theory?
Chadwick
Neutrons have no charge in the nucleus
Who was the first scientist to leave gaps for undiscovered elements in his version of the periodic table?
Dmitri Mendeleev
What discovery proved Mendeleev’s periodic table to be correct and Newland’s be wrong?
The discovery of protons and isotopes
