50 points for simple and good science questions!

d must be gymnosperms, lotus seeds have shells on the outside, and that is called "the coating on the outside of the fruit"!

b is the stem, and the root should be the same thing as the tendrils on the lotus root, I'm sure.

aI am sure, because lotus belongs to the plankton category, so I am sure!

1.The number of protons must be different depending on the type of atom. Because the atomic number is determined by the number of protons, and the number of neutrons has different isotopes.

2.There is no such thing as a sodium chloride molecule. A molecule refers to an elemental substance or compound formed by molecular bonds, one of the characteristics of which is that it is saturated.

In ionization, the cation loses one or several electrons, and the anion gains one or several electrons, resulting in the proportion of cations and cations in the ion crystal, in which the chemical bonds are ionic bonds. Carbon dioxide is a molecule in which one carbon atom is covalently bonded to two oxygen atoms and is not an ion.

3.The last one is an academic question that has no practical meaning. In fact, in Western science, two isotope atoms are counted as the same element, but there is no distinction between them and not the same kind of atom.

The chemical properties of the isotopes can be said to be the same, but the physical parameters (e.g., density) are different, from which we can carry out enrichment and purification.

1.Isotope definition: Different nuclides of the same element with the same number of protons, different numbers of neutrons (or different masses) are isotopes of each other. So the isotopes must be the same element, but the number of neutrons is definitely different, and the comparison is made at the atomic level.

The type of element depends on the number of protons; The type of atom depends on the number of protons, neutrons.

2.Judging by the category to which the substance belongs:

1. Active metal oxides (Na2O, CaO, Na2O2, etc.), strong bases and most salts belong to ionic crystals (except AlCl3 and BeCl2, which belong to molecular crystals);

2 Most non-metallic elemental substances (except diamond, graphite, crystalline silicon, boron), gaseous hydrides, non-metallic oxides (except SiO2), acids and most organic compounds (except organic salts), and noble gases are molecular crystals;

3 Elemental metals (other than mercury) and alloys are metallic crystals;

4 Diamond, crystalline silicon, crystalline silicon dioxide, silicon carbide, boron, etc. belong to atomic crystals (generally only need to remember the first four).

3.The type of atom depends on the number of protons, neutrons.

1.This statement is wrong. The number of protons and neutrons of the same kind of atom is equal.

2NaCl is , which is an ionic crystal; Carbon dioxide is not, it is a molecular crystal, there are no ions.

3 is not, and 1 can be known.