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www.quora.com/How-many-protons-neutrons-and-electrons-does...

So for an atom to be known as a beryllium atom, it must have 4 protons. For example, if an atom has 5 protons, it will no longer be beryllium, but will instead be boron. Any atom that doesn’t have 4 protons is not lithium . The amount of electrons must be the same as the number of protons in the atom for it to be neutrally charged.

hobart.k12.in.us/ksms/PeriodicTable/beryllium.htm

Number of Protons: 4: Number of Neutrons: 5: Number of Electrons: 4: Melting Point: 278.0° C: Boiling Point: 2970.0° C Density: 1.8477 grams per cubic centimeter: Normal Phase: ... Beryllium fluoride (BeF 2) Interesting facts: It does not corrode (rust). It is stronger than steel but is the lightest metal.

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)

www.reference.com/science/many-electrons-beryllium-2c4ac8c...

Using a periodic table, the number of electrons is found by finding the atomic number of beryllium, which is four. The atomic number is equal to the number of protons of a given element. However, the number of protons is also the same as the number of electrons for neutral atoms.

www.enotes.com/homework-help/how-many-neutrons-protons...

Beryllium has an atomic number of 4 and an atomic mass of 9. Each atom consists of neutrons, protons and electrons. The number of each of these sub-atomic particles can be calculated by knowing ...

www.chemicalelements.com/elements/be.html

Name: Beryllium Symbol: Be Atomic Number: 4 Atomic Mass: 9.012182 amu Melting Point: 1278.0 °C (1551.15 K, 2332.4 °F) Boiling Point: 2970.0 °C (3243.15 K, 5378.0 °F) Number of Protons/Electrons: 4 Number of Neutrons: 5 Classification: Alkaline Earth Crystal Structure: Hexagonal Density @ 293 K: 1.8477 g/cm 3 Color: gray Atomic Structure