Question

Which of these statements is not true?

A. Atoms of the same elements can have different masses.

B. The nucleus of an atom has a positive charge.

C. Atoms of isotopes of an element have different numbers of protons.

D. Atoms are mostly empty space.

Answer 1

A

Answer 2

Atoms of the same elements has to have same mass, or they would be different elements
Nucleus of an atom always has a positive charge
Atoms of isotopes of an element have different number of neutrons (not protons)
Atoms are indeed mostly empty space, nucleus is very small, and electrons are even smaller than it

So your best answer would be A

Answer 3

no.

Atoms of the same elements CAN have different masses,
different isotopes of an element have different numbers of neutrons in the nucleus, this make different isotopes have different mass.

for example C-12, C-13, C-14 have respective atomic masses of 12,13,14 grams per mole

Answer 4

Oh im sorry, unkle is right, correct answer would be C, seeing how that statement is false (i even corrected it on my 1st post lol).

Answer 5

C is the false option because the element is defined by the number of protons, and the isotope is defined by the number of neutrons

Answer 6

Its C. Isotopes of the element can have different number of neutrons. Protons would be different.