Which statement about an atom is correct?(1 point)
A:The proton has no charge and is found in the nucleus.
B:The neutron has no charge and is found outside of the nucleus
C:The neutron has a negative charge and is found in the nucleus
D:The electron has a negative charge and is found outside of the nucleus.
D: The electron has a negative charge and is found outside of the nucleus.
Cobalt has a mass number of 59 and an atomic number of 27. A student wants to create a model of a cobalt atom. Which statement about the model is correct?(1 point)
A:The model should show 27 protons and 27 neutrons.
B:The model should show 27 protons and 32 neutrons.
C:The model should show 59 protons and 27 neutrons.
D:The model should show 32 protons and 59 neutrons.
B: The model should show 27 protons and 32 neutrons.
In a molecule of lithium sulfide, there are two atoms of lithium and one atom of sulfur. Which statement about lithium sulfide is correct?(1 point)
A:The chemical formula for lithium sulfide is LiS2.
B:A molecular model of lithium sulfide would have two spheres.
C:Both lithium and sulfur form positive ions
D:The atoms in lithium sulfide are held together by bonds.
D: The atoms in lithium sulfide are held together by bonds.
DWhat will make an atom without an electrical charge? (1 point)
Responses
A:An equal number of protons and electrons, because electrons are positively charged and protons are negatively charged.
B:An equal number of protons and electrons, because electrons are negatively charged and protons are positively charged.
C:More electrons than protons, because electrons are negatively charged and protons are positively charged, and electrons are much smaller than protons
D:An equal number of neutrons and electrons, because neutrons are positively charged and electrons are negatively charged.
B: An equal number of protons and electrons, because electrons are negatively charged and protons are positively charged.
If a substance is made of a single element, it is(1 point)
Responses
A: made of multiple types of atoms that have chemically bonded together.
B:made of one atom.
C:made of one type of atom.
D:made through chemical reactions
C: made of one type of atom.
Which element has the same number of valence electrons as bromine (Br)?
(1 point)
A:potassium (K)
B:selenium (Se)
C:krypton (Kr)
D:chlorine (Cl)