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Berylium with an electron structure of 1s22s2 has 4 electrons.
The only subatomic particles that exist in an atom are protons, neutrons, and electrons.
The subatomic particles of the Atom (neutrons, protons, electrons) are released at high velocity. Some of these particles can strike other atoms and cause them to break apart, releasing large amounts of energy; this is called nuclear fission (atoms fissioning into lighter atoms). A self-sustaining fission reaction where atoms break apart, and cause other atoms to break apart, can be created with many radioactive elements such as Plutonium or Uranium in an event called a Chain Reaction.
Five atoms
2 Sulfur atoms and 3 Oxygen atoms
3
The amount of atoms in H3O4 can be determined by adding the subatomic numbers. 3 atoms of hydrogen and 4 atoms of oxygen equal 7 atoms.
Berylium is a metal element. There are 4 electrons in a single atom.
4
2
Calcium atoms have 20 protons and 20 electrons. The number of neutrons varies with the isotope.
There are four electrons in atomic beryllium.
Like all other atoms it contains three subatomic particles, they are Protons, Neutrons and Electrons.
Atoms can have anywhere from 1 to somewhere around 260-290 subatomic particles. The protons and neutrons are located in a clump in the center of the atom, surrounded by rapidly revolving electrons
4 protons and about 5 neutrons
As all atoms Mercury contain protons, neutrons and electrons. Mercury has 80 electrons and protons and a variable number of neutrons - depending on the isotope.
The Wikipedia lists an estimate of 10 to the power 80 hydrogen atoms for the observable Universe. The total number of particles would be somewhere in that order, depending on what "particles" you are thinking of.