The atomic/proton no. of beryllium is 3. Thus the number of protons is 3.
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Beryllium has 4 protons and electrons; the number of neutrons is variable, depending on the isotope.
Number of neutrons = Atomic Mass of the isotope - Atomic number (for Be is 4)
To answer this, we need to look at a Periodic Table. From there, we see that beryllium's atomic number is 4. That means that beryllium has 4 protons.
The number of protons in the nucleus of an atom is equal to the atomic number of the element.
For an atom of xenon, the number of particles in the nucleus would be the sum of the protons and neutrons. Xenon has 54 protons and usually around 78 neutrons, so the total number of particles in the nucleus would be around 132.
There are 9 protons in the element fluorine.
The nucleus of an atom has a positive electrical charge, the electrons have a negative electrical charge, and the nucleus is thousands of times heavier than the electrons (the exact ratio of weight varies, because although there are always as many protons as electrons, in a neutral atom, the number of neutrons varies).
An argon atom has 18 protons.