Beryllium has 4 electrons
A neutral atom with four electrons must contain four protons in the nucleus in order to maintain an overall neutral charge.
That neutral silicon atom has four electrons in its valence shell.
A neutral atom must contain an equal number of electrons because it is a neutral atom.
In a neutral atom, the number of electrons is equal to the number of protons. So, in an atom with three protons, it would contain three electrons. The number of neutrons does not affect the charge or number of electrons in the atom.
Berylium with an electron structure of 1s22s2 has 4 electrons.
No, having four valence electrons does not determine whether an atom is an anion. An anion is formed when an atom gains electrons to have a negative charge. If the atom with four valence electrons gains four more electrons, it would become an anion.
That depends on the element. Any such atom with more than four protons will gain electrons to become electrically neutral. If that atoms has four protons (beryllium) then it will be able to form a stable ion with two electrons. If it is left with three electrons it will either gain an electron to form a neutral atom or, if in the presence of an oxidizing substance, lose an electron to form an ion. If the atom has three protons (lithium) it will form a stable, neutral atom with three electrons but will lose one electron when it reacts to form a stable ion. If that atom has two protons (helium) then it will only be stable with two electrons and will gain or lose electrons accordingly to maintain that number. If the atom has one proton (hydrogen) then it will tend to share electrons rather than gaining or losing them. It forms a neutral atom with one electron but can form an ion with two. It has no stable configuration with three electrons.
The charge on the tin atom would be +4 if four electrons have been removed. This is because each electron carries a negative charge of -1, so removing four electrons results in a net positive charge of +4 on the atom.
A beryllium ion, like Be2+, has lost two electrons compared to a neutral beryllium atom. A neutral beryllium atom has 4 electrons, with 2 in the inner shell and 2 in the outer shell. When it loses 2 electrons to become Be2+, it now has 2 electrons remaining, both in the inner shell.
A neutral silicon atom will have 14 electrons, one for each proton in its nucleus. A link follows and can be found below.
Number of Protons=Atomic Number. In a neutral atom (any atom listed in the periodic table), the number of protons equals the number of electrons. This is because a proton has a +1 charge and an electron has a -1 charge. Example: Carbon has an atomic number of 6. A neutral carbon atom therefore has 6 protons and 6 electrons. Unrelated, but sort of more relevant, carbon has four valence electrons. If the carbon was written like so: C+, then the carbon would have a positive 1 charge and would have one less electron than the neutral carbon. The number of protons would remain the same at 6, but the total number of electrons would be 5.
The electronic configuration of a neutral sulfur atom is 1s2 2s2 2p6 3s2 3p4. This indicates that sulfur has two electrons in the 1s orbital, two electrons in the 2s orbital, six electrons in the 2p orbital, two electrons in the 3s orbital, and four electrons in the 3p orbital.