Chemistry Flashcards
How do you work out the atomic number?
The number of protons / electrons
How do you work out atomic mass?
Protons + neutrons
What is the overall charge of an atom?
0
Will a group 7 ion be negatively or positively charged?
Negatively (gains one ion for the outer shell)
Who said atoms are tiny, hard spheres that cannot be split?
John Dalton
Who came up with the plum pudding model?
J.J Thompson
Who fired alpha particles at thin gold?
Ernest Rutherford
Who found that atoms were mostly empty space?
Ernest Rutherford
Who discovered the existence of electron shells?
Niels Bohr
Who proved the existence of neutrons?
James Chadwick
Name the order of the 5 scientists that explored atoms
Dalton, Thomson, Rutherford, Bohr, Chadwick
What is the centre of an atom called?
Nucleus
What is the atomic number of sodium?
Na23
11
11
Will a group 1 ion be positively or negatively charged?
Positively (lose one electron to fill outer shell)
Name 3 greenhouse gases
Carbon dioxide, Methane, Nitrous oxide
Are metals insulators or conductors?
Conductor (of heat and electricity)
Are non metals brittle or malleable?
Brittle
Are non metals magnetic?
No
How were periodic tables ordered before Moseley
By atomic mass
Name a reason Newlands’ periodic table was rejected by other scientists
Some spaces had more than 1 element, As elements were added elements in the same group started having different properties
What did Newlands’ notice about every 8th element?
They had similar properties
What was Newlands’ periodic table called?
Newlands’ Octaves
What did Mendeleev do that improved upon Newlands’ periodic table?
He left gaps for undiscovered elements
What was Mendeleev able to do with his periodic table?
Make predictions about new elements
