periodic table Flashcards
1
Q
humphry davy discovery
A
elements potassium calcium strontium
2
Q
atomic number
A
number of protons in an element
3
Q
no two elemens have the same
A
atomic number
4
Q
dobreiner triad example
A
Cu: copper
Ag: silver
Au: gold
5
Q
a triad is three elements in order of
A
atomic mass
6
Q
newlands octaves
A
a group of elements arranged in order of increasing atomic weight, where the first and eight element have similar properties
7
Q
newlands octaves probloms
A
- only worked on first 16 elements
- not all elements were discovered
8
Q
periodic law
A
properties of elements arranged in order of increasing atomic mass, vary periodically
9
Q
difference between mendeleev and newland
A
- mendeleev left empty space for new elemnts to be discovered
- mendeleev reversed orders of elements to make them fall into similar groups
10
Q
mendeleev reverse order example
A
iondine
flourine
cholrine
bromine
11
Q
what did moseley study
A
frequencies of x-rays emitted by atoms
12
Q
modern periodic table arrangment
A
is arranged according to increasing atomic number
13
Q
A
