Defining the Atom.
Structure of the Nuclear Atom
Distinguishing Among Atoms
Organising the Elements
Classifying the Elements
100
An Atom is...........
Small particles that make up all elements.
100
Who discovered electrons?
Thomson
100
The protons equal what?
The atomic mass= protons
100
What is a Metalloid ?
elements that have properties that are similar to those of metals and nonmetals.
100
Group B elements are called............
Transition elements
200
Atoms can be observed by
Scanning electron microscope
200
Who discovered the nucleus?
Rutherford
200
Neutrons equal what?
Neutrons =Mass number - protons
200
Who made the first periodic table?
Mendeleev
200
Inert gases are which group in the periodic table?
Group 8A (Nobel gases)
300
Dalton atomic model was a ........ball
solid
300
What are the three subatomic particles and their charges?
electrons- negative Proton- positive Neutrons- neutral
300
Isotopes have the same mass number but different atomic number. True? False?
False
300
How did Mendeleev arranged his periodic table?
by increasing atomic mass
300
Li is a: a)Alkali metal b) transition metal c) alkaline earth metal
a) Alkali metal (1A)
400
what was Democritus contribution to the discovery of the atom?
was a philosopher (Not a scientist) He claimed that matter was made of small, hard particles that he called “atomos”
400
Anode is negatively charged. true? false?
False
400
Are the following isotopes? Carbon-12 and Carbon-13
yes they are isotops
400
The element with almost a 69 mass number is ......
Ga (Gallium)
400
What is a valance electron?
electrons in the highest occupied energy level.
500
A sample of copper with a mass of 60g contains (7.02x10) atoms. Calculate the mass of a single copper atom.
0.85
500
Rutherford experiment is called..............
Gold-foil experiment
500
Isotope 1 has an Atomic mass of 10.012 and Percent 19.91%. Isotope 2 has an Atomic mass of 11.009 and Percent 80.09%. What is the atomic mass for the element?
10.81
500
What did the (?) mark in Mendeleev's periodic table meant?
These elements weren't discovered yet
500
If an element is in group 2 and period 5. What is its energy level and number of valance electrons?
energy level=5 Valance electrons=2
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