An element is an element based on the number of _________________.
protons and neutrons
neutrons
electroncs
protons
Electrons are located outside the nucleus in orbitals called shells.
True
False
The first obital/shell of an atom can hold up to _____________electrons.
1
2
4
8
The second obital of an atom can hold up to _____________electrons.
1
2
4
8
The number of valence electrons determines the
A electromagnetism of an atom.
B chemical properties of an atom.
C stability of an atom.
D A, B, and C are correct
E B and C are correct
If needed, refer to a Periodic Table to help you with this question. How many more electrons could fit in the 2nd orbital shell of oxygen?
A 1
B 2
C 3
D 4
An atom is most stable when its outer shell only has half the valence electrons in it.
True
False
Practice reading a Periodic Table. Hydrogen's atomic symbol is H, atomic mass is 1.008, atomic number 1, # of protons 1, # of neutrons 0, # of electrons 1, and is located in Group 1, Period 1.
A True
B False
C False because Hydrogen also has 1 neutron.
D False because hydrogen is in Group 2, Period 2.
Practice reading a Periodic Table. Helium's atomic symbol is He, atomic mass is 4.0026, atomic number 2, # of protons 2, # of neutrons 2, # of electrons 2, and is located in Group 13, Period 1.
A True
B False
C False because Helium is in Group 2.
D False because Helium is in Period 2.
Practice reading a Periodic Table. Neon's atomic symbol is Ne, atomic mass is 20.180, atomic number 10 meaning that Neon has the exact same number of 10 protons, 10 neutrons, and 10 electrons. Neon is located in Group 2, Period 2.
A True
B False
C False because Neon is in Group 18, Period 2.
D False because Neon is in Group 18 and Period 4.
Select the correct word that matches this definition:
an atom that has gained or lost at least one electron
A molecule
B compound
C element
D ion
Select the correct word that matches this definition:
composed of at least two different types of atoms
A molecule
B compound
C element
D ion
Select the correct word that matches this definition:
composed of the same type of atoms
A molecule
B compound
C element
D ion
If an atom has lost an electron, then it has an extra __________________making the ion _____________ because the numbers of electrons and protons aren't equal anymore.
A proton....negative
B proton...positive
C electron....negative
D electron....positive
If an atom has gained an electron, then it has an extra __________________making the ion _____________ because the numbers of electrons and protons aren't equal anymore.
A proton....negative
B proton...positive
C electron....negative
D electron....positive
Mg+4 would indicate that magnesium has lost 4 electrons.
True
False
Cl- would indicate that chlorine has gained one extra electron.
True
False
When an element loses an electron, the element becomes a _______________ion
A positive
B negative
C neutral
When an element gaines an electron, the element becomes a _______________ion
A positive
B negative
C neutral
What do the three isotopes of element X have in common?