Answer: By definition, if the atomic number =
7
, then there are 7 protons, 7 electrons, and 8 neutrons!
Explanation:
The atomic number is by definition the number of protons, positively charged particles, contained within the atomic nucleus. So if there are 7 protons, there MUST be 7 electrons, 7 negatively charged particles. Why? Because matter is electrically neutral, and positive and negative particles must be equal.
Electrons have negligible mass; the mass number depends on the number of protons contained within the nucleus, PLUS the number of neutrons. Given that we have 15 N
, there must be 8 neutrons contained within the nucleus. does this help?
Animals cells have a mitochondria, plant cells have a vacuole, a chloroplast and a cell wall for protection.
Answer is A all living things need to go through the photosynthesis cycle and need oxygen to sustain life
<span>The layer of Earth's atmosphere where atoms and molecules escape into space is referred to as the ozone layer</span>
