An atom of an element with atomic number 18 and mass number 40 has the following articles:
A. 18 protons, 18 electrons, 22 neu­trons
B. 18 protons, 22 electrons, 18 neu­trons
C. 22 protons, 18 electrons, 18 neu­trons
D. 22 protons, 22 electrons, 18 neu­trons
Answer:A
An atom of an element with atomic number 18 and mass number 40 has the following articles:
A. 18 protons, 18 electrons, 22 neu­trons B. 18 protons, 22 electrons, 18 neu­trons C. 22 protons, 18 electrons, 18 neu­trons D. 22 protons, 22 electrons, 18 neu­trons