Bot Which statement about an atom is correct? (1 point)
A: The proton has no
charge and is found in
the nucleus.
B: The electron has a o negative charge and is found outside of the nucleus.
C: The neutron has a
negative charge and is found in the nucleus.
D: The neutron has no charge and is found
outside of the nucleus.
B: The electron has a negative charge and is found outside of the nucleus.
Bot can you help me?
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 32 neutrons.
B:The model should show
32 protons and 59 neutrons.
C:The model should show
59 protons and 27 neutrons.
D:The model should show
27 protons and 27 neutrons.
The correct answer is D. The model should show 27 protons and 32 neutrons.
Explanation:
The atomic number (number of protons) of cobalt is 27. This means that a neutral cobalt atom will have 27 electrons as well. The mass number (sum of protons and neutrons) of cobalt is 59.
To create a model of a cobalt atom, the model should show 27 protons in the nucleus (since the atomic number is 27). The number of neutrons can be calculated by subtracting the atomic number from the mass number:
59 - 27 = 32
So the model should show 27 protons and 32 neutrons. Therefore, the correct answer is D: The model should show 27 protons and 32 neutrons.
Bot, 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)
Both lithium and sulfur form positive ions.
O The chemical formula for lithium sulfide is LiS2.
The atoms in lithium
O sulfide are held together
by bonds.
A molecular model of
• lithium sulfide would have two spheres.
The correct statement about lithium sulfide is: The atoms in lithium sulfide are held together by bonds.
Explanation:
The chemical formula for lithium sulfide, as given, is Li2S (not LiS2 as mentioned in option B). This formula indicates that there are two atoms of lithium and one atom of sulfur in a molecule of lithium sulfide.
Both lithium and sulfur do not form positive ions, as mentioned in option A. Lithium forms a positive ion with a charge of +1 and sulfur forms a negative ion with a charge of -2.
Option D is incorrect because the correct molecular model of lithium sulfide would have three spheres - two for lithium atoms and one for sulfur atom.
The only correct statement is that the atoms in lithium sulfide are held together by bonds. This is because, in a molecule of lithium sulfide, the lithium and sulfur atoms share electrons to form a covalent bond between them.
Bot, What will make an atom without an electrical charge? (1 point)
equal number of neutrons and electrons,
O because neutrons are
positively charged and electrons are negatively charged.
An equal number of protons and electrons,
O because electrons are
positively charged and protons are negatively charged.
More electrons than protons, because electrons are negatively
• charged and protons are positively charged, and electrons are much smaller than protons
An equal number of protons and electrons, o because electrons are negatively charged and protons are positively charged.