- How do you determine the number of electron shells?
- Why do atoms want to be stable?
- When an atom is stable What will be true?
- Why is it called radioactive?
- Do atoms want to be neutral?
- Why are half filled shells more stable?
- Why are large nuclei more unstable?
- Why do atoms bond together?
- Which type of radiation is the most penetrating?
- What does having a full outer shell mean?
- Why are full shells stable?
- Why is H+ unstable?
- Why are nuclei unstable?
- Why lighter nuclei are unstable?
How do you determine the number of electron shells?
Each shell can contain only a fixed number of electrons: The first shell can hold up to two electrons, the second shell can hold up to eight (2 + 6) electrons, the third shell can hold up to 18 (2 + 6 + 10) and so on.
The general formula is that the nth shell can in principle hold up to 2(n2) electrons..
Why do atoms want to be stable?
All atoms are eager to become octet-in which the total number of the electrons in the outermost shell is equal to eight (since 8 is the total no. of electrons the last shell can carry) and it cannot accept electrons anymore so it becomes stable. … That’s why they want to be stable and complete their vacancies.
When an atom is stable What will be true?
A stable atom has a net charge of 0. In other words, it has an equal number of protons and electrons. The positive protons cancel out the negative electrons. When the number of electrons does not equal the number of protons, the atom is ionized.
Why is it called radioactive?
What causes radioactivity? As its name implies, radioactivity is the act of emitting radiation spontaneously. This is done by an atomic nucleus that, for some reason, is unstable; it “wants” to give up some energy in order to shift to a more stable configuration.
Do atoms want to be neutral?
However, remember that opposite charges attract and like charges repel: so, a positively charged atom will attract electrons until it becomes neutral, whereas a negatively charged atom will repel some of its electrons until it also becomes neutral. So only neutral atoms are stable. Hope these help!
Why are half filled shells more stable?
The exactly half-filled and fully filled orbitals have greater stability than other configurations. The reason for their stability are symmetry and exchange energy. The electrons present in the different orbitals of the same sub-shell can exchange their positions.
Why are large nuclei more unstable?
Greater number of protons and neutrons render the nucleus and thus atom unstable. Not all the nuclei but the larger nuclei usually are unstable containing greater number of protons and neutrons.
Why do atoms bond together?
Atoms form chemical bonds to make their outer electron shells more stable. … An ionic bond, where one atom essentially donates an electron to another, forms when one atom becomes stable by losing its outer electrons and the other atoms become stable (usually by filling its valence shell) by gaining the electrons.
Which type of radiation is the most penetrating?
gammaThere are three types of nuclear radiation: alpha, beta and gamma. Alpha is the least penetrating, while gamma is the most penetrating.
What does having a full outer shell mean?
When a shell completes its duplet or octet, it becomes complete or we can say attain a full outermost shell. As helium has only two electrons. So, they remain only in first shell which requires only two electrons to be completed. So, helium’s outermost shell is considered complete.
Why are full shells stable?
An atom may gain or lose electrons to achieve a full valence shell, the most stable electron configuration. … This means that they can achieve a stable configuration and a filled outer shell by donating or losing an electron. As a result of losing a negatively-charged electron, they become positively-charged ions.
Why is H+ unstable?
Hydrogen only has one electron in its lowest energy level. This is a very unstable arrangement, and hydrogen gas undergoes a variety of reactions so as to reach a stable electron configuration where its energy level is either empty of electrons, or filled with electrons.
Why are nuclei unstable?
Too many neutrons or protons upset this balance disrupting the binding energy from the strong nuclear forces making the nucleus unstable. … An unstable nucleus tries to achieve a balanced state by given off a neutron or proton and this is done via radioactive decay.
Why lighter nuclei are unstable?
An atom is stable if the forces among the particles that makeup the nucleus are balanced. An atom is unstable (radioactive) if these forces are unbalanced; if the nucleus has an excess of internal energy. Instability of an atom’s nucleus may result from an excess of either neutrons or protons.