1. The symbol for an isotope of lithium that has a mass of 6 and a charge of +1 is ⁶₃Li⁺
2. If the ratio of the neutron and proton in the nucleus of an atom increases, the nucleus becomes unstable.
3. Allie's hypothesis is correct because atoms B and C have the same atomic number but different neutron numbers, hence, they are isotopes.
4. Rana's hypothesis is wrong because the number of electrons is greater than the number of protons, hence atom C is a negative ion.
5. The symbols are wrong for the following reasons;
- MG is wrong because the symbol of atoms consists of first a capital letter, and then a small letter
- ca is wrong because the symbol of atoms consists of first a capital letter, and then a small letter
- nE is wrong because the symbol of atoms consists of first a capital letter, and then a small letter
<h3>What determines the charge on an atom of an element?</h3>
The charge on an atom of an element is determined by the number of protons and neutrons in the atom.
A neutral atom has an equal number of protons and electrons, a negative atom has more electro than protons, while a positive ion has more protons than electrons.
Isotopes of elements are atoms of the same element having the same number of protons but different numbers of neutrons.
Learn more about isotopes at: brainly.com/question/27198009
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Thomson's model of the atom was called the plum pudding model. He discovered electrons, so he placed them in the atoms. This was before the nucleus was discovered.
Now, the current model is an atom that contains a positively charged nucleus (with both protons and neutrons), and negatively charged orbitals with electrons.
<u>Answer:</u> The mass of plastic sheet is 
<u>Explanation:</u>
The plastic sheet is in the form of cuboid. To calculate the volume of cuboid, we use the equation:
where,
V = volume of cuboid
l = length of cuboid = 10.0 m = 1000 cm (Conversion factor: 1 m = 100 cm)
b = breadth of cuboid = 1.0 m = 100 cm
h = height of cuboid = 1 cm
Putting values in above equation, we get:
To calculate mass of a substance, we use the equation:
We are given:
Density of plastic sheet = 
Volume of plastic sheet = 
Putting values in equation 1, we get:
Hence, the mass of plastic sheet is
It could be both A. and B. but most likely B. because the star can b big but have the same temperature as a smaller star.
