Answer:
The mass number (symbol A, from the German word Atomgewicht [atomic weight]),[1] also called atomic mass number or nucleon number, is the total number of protons and neutrons (together known as nucleons) in an atomic nucleus. It is approximately equal to the atomic (also known as isotopic) mass of the atom expressed in atomic mass units. Since protons and neutrons are both baryons, the mass number A is identical with the baryon number B as of the nucleus as of the whole atom or ion. The mass number is different for each different isotope of a chemical element. Hence, the difference between the mass number and the atomic number Z gives the number of neutrons (N) in a given nucleus: N = A − Z.[2]
The mass number is written either after the element name or as a superscript to the left of an element's symbol. For example, the most common isotope of carbon is carbon-12, or 12
C
, which has 6 protons and 6 neutrons. The full isotope symbol would also have the atomic number (Z) as a subscript to the left of the element symbol directly below the mass number: 12
6C
.[3]
Answer:
There are advantages and disadvantages of sexual reproduction, compared to asexual reproduction. The main issues are: Advantages: More variation assists with survival. It increases the chance that at least some offspring of a parent survive.
Explanation:
Answer:
Air,water,land,these are the A-biotic factors of the environment and are associated with life in many ways and life is totally defendant on these A-biotic factors of the life
Explanation:
Life is basically dependent on two components the biotic (living things) and A-biotic (non living) components of life.Living component are inked to each other with food chain and the energy is transferred between the food chains and the energy is made by the producer with the help of a biotic factors associated with the life. By using A-boitic component the producers the primary component of the food chain make the food and is consumed by the consumers and then the same way the energy is transferred from on level to the next level and energy is consumed up to 10 percent in each level of the food chain.
The SYMPATHETIC nervous system prepares the body to expend energy whereas the PARASYMPATHETIC nervous system allows the body to restore and conserve energy
