SC1 - ATOMIC STRUCTURE + THE PERIODIC TABLE Flashcards
1
Q
proton location
A
nucleus
2
Q
neutron location
A
nucleus
3
Q
electron location
A
shells that orbit the nucleus
4
Q
proton mass
A
1
5
Q
neutron mass
A
1
6
Q
electron mass
A
almost 0
7
Q
proton charge
A
+1
8
Q
neutron charge
A
0
9
Q
electron charge
A
-1
10
Q
mass number
A
mass of an atom; number of protons + number of neutrons
11
Q
atomic number / proton number
A
number of protons in an atom (equal to number of electrons in a NEUTRAL atom)
* if the proton number changes, the element changes.
12
Q
isotope definition
A
the same element that has a different number of neutrons -> different mass
13
Q
relative atomic mass calculation taking into account isotopes
A
(mass1 x frequency (%)) + (mass2 x frequency (%))
/100
14
Q
Mendeleev’s periodic table (features)
A
- arranged in order of increasing mass
- left gaps in his periodic table for elements that has not been discovered and correctly predicted the properties of these elements
15
Q
the modern periodic table (features)
A
- columns (I) of elements are called groups
- groups of elements have similar properties
- rows (—) of elements are called periods
