Number of proton K=19
so, 42 - 19 =23
then the answer in 19 protons and 23 neutrons
<span>An object at rest will stay at rest unless acted upon by a unbalanced force.
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Don't touch your eyes.
Never taste-test unless the teacher tells you to.
Do not touch anything without directions.
Wear safety goggles.
Wash your hands after each experiment.
Wear proper lab clothes.
Do not mishandle lab equipment.
Clean up your workplace.
Act serious; no horseplay!
Report accidents to the teacher right away!
Have a great day, scholar!
Hydrogen is the only atom that does not have neutron electrons in the first energy level/shell.
