Part 1 Flashcards
(73 cards)
Maximum number of electrons that can find in the first three energy levels
2,8,8
What does the group number tells you about the electron structure
Number of electrons in the outermost shell
What does the period number tell you about the electron structure
Number of shells
What is an isotope
Element with the same number of electrons and protons, but different number of neutrons
Equation for relative atomic mass (Ar)
( (% X mass) + (% X mass) ) divided by 100
How can new experimental evidence affect a model
Scientific model being changed
Describe John daltons model of the atom
Tiny spheres
Describe JJ Thompsons plum pudding model
A ball of positive charge white negative electrons embedded
Rutherfords alpha scattering experiment. Describe the conclusion
Atom has a dense, positive centre surrounded by empty space
How did Niels Bohr’s contribute to the atomic model
Electrons orbit the nucleus
James Chadwick’s contribution to the atomic model
Proved neutrons existed
How are elements in periodic table arranged
Increasing atomic number
Describe how scientists before ordered it
Atomic weights
What did Mendeleev do to contribute to the modern periodic table
Left gaps for undiscovered elements and change the order they where put in
Atoms in Pure metals are arranged…
In regular rows
Atoms in pure metals are…
Same size
Atoms in alloys are…
Varying size because more than one type of atom is present
Atoms in alloys are arranged…
Irregularly
Atoms that are in regular rows can…
More easily slide over each other
What is an alloy
Solid mixture containing at least one metal
Halogens all have…
Low melting and boiling points
Fluorine is…
Pale yellow gas at Room temp
Chlorine is…
Green gas at room temp
Bromine is…
Brown/orange liquid at room temp
