Pg 5-20 Flashcards
What is matter?
anything that has mass & takes up space
ex air
Techniques to separate matter?
Mechanical, settling, flotation, filtration, extraction, crystallization, chromatography
The number of protons in the nucleus of one atom of an element is?
a) always greater than the number of neutrons
b)less than the number of electrons
c)always equal to the number of neutrons
d) the atomic number
d) the atomic number
Elements that react strongly with water and are very soft metals are part of the family called
Halogens, transition metals, noble gases or alkali metals?
Alkali metals
What classification cases fatal or toxic effects when exposure occurs?
Skull and cross bones
The number of neutrons found in sulfur-34 is?
18
Which element is found in Group #17 and Period #3?
Question options:
scandium
fluorine
bromine
chlorine
Chlorine
When phosphorous chemically combines with another element to form an ion, the phosphide ion will have an overall charge of:
Question options:
+3
-3
-1
-2
-3
The sum of the protons and neutrons in the nucleus of an atom of an element is the?
Mass number , isotope , atomic number or nucleus
Mass number
The atomic number for gold is:
196.97
47
107.87
79
79
The number of electrons in O2- ion is?
10
6
18
8
10
Elements that have the same atomic number but different mass numbers are?
ions
isotopes
electrons
protons
Isotopes
J.J. Thomson is credited with the discovery of the electron.
Question options:
True
False
True
The modern theory of the atom states that electrons are located in stationary orbitals around the nucleus and are not free to move around.
Question options:
True
False
False
The atomic number of aluminum-27 is?
3
27
14
13
13
First level can hold how many electrons____
Second level can hold _____
Third level can hold ____
2,8,8
What is a stable octet
Arrangement of eight electrons in the outermost occupied energy level
Is anion negative or positive?
Negative
Are Cations negative or positive
Positive
Atomic number ?
Number of protons in an atoms nucleus
Mass number?
Sum of the number of protons and neutrons in a atoms nucleus
What group are halogens ?
17
Heterogeneous?
Diff components visible n u can separate them
What did jj Thomson find?
Discovered that negatively charged particles are called electrons created the plume pudding model
Groups are vertical or horizontal?
Vertical columns
What family is magnesium in?
Alkaline earth metals
Halogens
Noble gases
Alkali metals
Alkaline earth metals
What is valence energy
Outermost occupied energy level of an atom
Valence electrons
Electrons in the valence energy level
