I need understanding this biology question?
Which of the following statesment are correct? explain your answer please
a. an atomic number contains protons and neutrons
b. an atom has more electrons than protons
c. the atomic nucleus is surrounded by a double membrane
d. all atoms of the same element have the same number of neutrons
d. the number of neutrons determines the whether the nucleus of an atom is stable or radioactive
1 Answer | Add Yours
Let us analyze each choces to help us in determining the right answer.
a. an atomic number is ONLY the number of the proton. Mass number is the sum of protons ans neutrons
b. in an atom, #of electrons = #of protons; if not it will be called an ion. if an element has more electrons, it would become a negatively charged ion or anion
c. the atomic nucleus is surrounded by electrons orbiting around it. the term double membrane is sometimes used in biology as the one that envelopes the nucleus of a cell not the nucleus of an atom.
d. the existence of isotopes enables the atoms of the same element to have different number of neutrons.
Carbon 12 have 6 protons, 6 electrons, 6 neutrons
Carbon 13 have 6 protons, 6 electrons BUT 7 neutrons.
and they are both called carbon.
e. the number of neutrons can determine if the atom is radioactive.
for example Iodine 127 and Iodine 130
Iodine 130 is the isotope since it has more neutrons than the normal iodine found in the periodic tabel.
The answer would be E
hope thie helps :)
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