Because of the discovery of isotopes, this is the point of Dalton's Atomic Theory that is no longer valid today.
ATOMS OF THE SAME ELEMENT ARE IDENTICAL.
100
Atoms having the same number of protons but different number of neutrons.
ISOTOPES
100
Which has a greater frequency, microwave or ultraviolet?
ULTRAVIOLET
100
The zigzag line or staircase line divides what?
METALS AND NONMETALS
100
Write the ground state electron configuration for the element Gallium.
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p1
200
This scientist shot alpha particles through a thin piece of gold foil and determined that the atom was made of mostly empty space.
RUTHERFORD
200
Found together with the protons inside the nucleus.
NEUTRONS
200
This form of radiation has the highest frequency and most energy.
GAMMA RAYS
200
Which arrangement in the periodic table shows similarity in physical and chemical properties?
VERTICAL ARRANGEMENT
200
Identify the element represented by the orbital filling.
↑↓ ↑↓ ↑↓ ↑ ↑
1s 2s 2p
OXYGEN
300
The small, dense positively charged center of an atom discovered using the gold foil experiment.
NUCLEUS
300
In carbon-14, what does 14 represents?
MASS NUMBER
300
Between IR and UV, which has a shorter wavelength and greater frequency?
UV
300
Which family in the periodic table containing the most reactive metals?
ALKALI METALS
300
Write the noble gas notation for the element arsenic
[Ar]4s2 3d10 4p3
400
This scientist discovered that electrons are moving around the nucleus in fixed orbits.
BOHR
400
Element X has two isotopes:
mass % abundance
isotope 1 6.015 amu 7.5
isotope 2 7.016 amu 92.5
Calculate the average atomic mass and identify the element
6.941 amu, LITHIUM
400
Yellow light has a wavelength of 5.60 x 10-7 meters. What is the frequency of this yellow light?
5.36 x 10 14 Hz
400
What is the reason why potassium and lithium belong to the same group or family?
SIMILARITY IN PHYSICAL AND CHEMICAL PROPERTIES
400
How will you collect pure drinking water from sugar solution with sand?
FILTRATION AND DISTILLATION
500
J.J. Thomson came up with this sweet model, which he believed accurately represented the structure of an atom.
PLUM PUDDING
500
Copper has two isotopes, copper-63 and copper-65. If the atomic mass of copper is 63.5 g/mol, what is the % abundance of each isotope?
75.0 % COPPER-63 and 25.0 % COPPER-65
500
23. What is the energy of a photon if it has a frequency of 6.82 x 10 14 Hz?
h = 6.626 x 10 -34 J s
4.52 x 10 -19 J
500
The ALKALI METALS are very reactive with water and with ______________ family in the Periodic Table.
HALOGEN
500
What can you say about the number of neutrons for aluminum-27 and silicon-28?