identify the number of protons ,electrons and neutrons of the following elements
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O. 15 electrons
4. The atom of an element is described using the following data: Z=19 and M=40. Which of the following statements is TRUE
about the atom?
a. It has 19 electrons and 20 neutrons
b. It has 19 protons and 19 neutrons
c. It has 21 electrons and 19 protons
d. It has 19 protons and 21 neutrons