Chlorine gain electrons.
Beryllium lose electrons (2).
An atom does not easily lose or gain electrons if is has an equal number of protons and electrons. The charges inside the atom cancel each other, making it neutral.
It loses 2 electrons.
an aluminum atom will lose the 3 electrons on its outer shell 2 for an aluminum ion.
Chlorine gain electrons.
Beryllium lose electrons (2).
The contact with an atom having a high affinity for electrons.
An atom does not easily lose or gain electrons if is has an equal number of protons and electrons. The charges inside the atom cancel each other, making it neutral.
It loses 2 electrons.
gain
The gain and/or lose of electrons.
Metals tend to lose electrons.
No. A metallic atom will typically lose electrons.
an aluminum atom will lose the 3 electrons on its outer shell 2 for an aluminum ion.
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.
Electrons in the outer most shell are called Valence Electrons.