The number of neutrons in a helium atom is TWO (2).
- Helium (He) is the second chemical element in the periodic table.
- Helium consists of two (2) protons and two (2) neutrons in its atomic nucleus.
- In consequence, the atomic number of helium is equal to two (2).
- The Sun contains approximately 25% He, which is generated by solar fusion.
In conclusion, the number of neutrons in a helium atom is TWO (2).
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Answer:
false
Explanation:
One characteristic of living things is they can't change and adapt over time.
The answer is A Plants use carbon and release oxygen, and animals release carbon and uses oxygen
Answer:
Part of Cell Theory:
- All living organisms are made of cells.
- Cells are the basic unit of structure and function in living things.
- Cells arise from prevoiusly existing cells.
Not Part of Cell Theory:
- All cells have DNA or other genetic material.
- Cells can be classified as prokaryotic or eukaryotic.
- Cells use energy to sustain life.
Expalanation
The postulates of cell theory are developed over the centuries which are now universally accepted. These are mentioned above. Although the other three statements are also correct but they are not the part of cell theory.
Answer:
Water is a covalent compound.
Explanation:
covalent compounds are individual molecules characterized by the sharing of electrons between two or more atoms. Two atoms with similar electronegativity will not exchange an electron from their outermost shell; the atoms instead share electrons so that their valence electron shell is filled.
Example:
Examples of compounds that contain only covalent bonds are methane (CH4), carbon monoxide (CO), Water (H2O) and iodine monobromide (IBr).
Properties:
1. At room temperature and normal atmospheric pressure, covalent compounds may exist as a solid, a liquid, or a gas.
2. Covalent compounds do not exhibit any electrical conductivity, either in pure form or when dissolved in water.
3. Covalent compounds have lower melting and boiling points.
