Which of the following statements is true about the lithium and the helium atoms? a. lithium has more protons, neutrons, and electrons. b. lithium is much smaller than helium. c. there is no difference between helium and lithium. d. helium has more protons, neutrons, and electrons. lium atoms?

Option (A) is the correct answer.

Explanation:

Atomic number of lithium is 3 and mass number is 7. It is known that atomic number represents the number of protons present in an atom and mass number is the sum of total number of protons and neutrons present in an atom.

Also, it is known that in a neutral atom number of protons equal number of electrons.

Therefore, in a lithium atom there are 3 protons, 4 neutrons and 3 electrons.

Atomic number of helium is 2 and its mass number is 4. Therefore, in a helium atom there are 2 protons, 2 neutrons and 2 electrons.

Hence, we can conclude that lithium has more protons, neutrons, and electrons as compared to helium.

answer: the blood-brain barrier is a layer of specialized membranes and cell processes designed to keep undesirable substances from passing from the bloodstream into the precious tissues of the brain. while the blood-brain barrier does keep most bad things out of the central nervous system, it is not impermeable.

explanation: