When an atom has an equal number of electrons and protons, it has an equal number of negative electric charges (the electrons) and positive electric charges (the protons). The total electric charge of the atom is therefore zero and the atom is said to be neutral.

Niels Bohr suggested that electrons in an atom were restricted to specific orbits and has a fixed boundaries around the atom’s nucleus. In Bohr’s model, electrons can only exist in certain orbits and thus, can only have certain energies. As a result, we say that the energies of the electrons are quantized.

Bohr’s Model of Atom (By Neils Bohr in 1913) This model of atom states that: An atom consists of heavy positively charged nucleus. The whole mass of the atom is concentrated in the nucleus. The electrons in an atom revolve around the nucleus in definite circular paths called orbits or energy level.

Nucleus. Every atom has no overall charge (neutral). This is because they contain equal numbers of positive protons and negative electrons. These opposite charges cancel each other out making the atom neutral.

Atoms are neutral if they have the same number of charged protons and electrons, balancing positive and negative charges. This is because water itself has slight charges. Answer 7: Atoms are electrically neutral because they have equal numbers of protons (positively charged) and electrons (negatively charged).

Explanation: If an atom is not neutral, then it will form an ion. In this case, the number of protons and electrons are not equal. If the atom gains one or more electrons, it will have more electrons than protons, and will form a negatively charged ion (anion).

Since an electron has the same magnitude of charge as a proton but opposite sign (electrons are negative), in order for an atom to be neutral, to have no net charge, the number of protons and electrons are equal to each other.

It is the number under the element symbol. For potassium it is about 39. This means that the atomic weight is 39 for both protons and neutrons. Since we know that the number of protons is 19 we can calculate the number of neutrons (39 19) as 20.

The name is derived from the english word potash. The chemical symbol K comes from kalium, the Mediaeval Latin for potash, which may have derived from the arabic word qali, meaning alkali. Potassium is a soft, silvery-white metal, member of the alkali group of the periodic chart.

Potassium atoms have 19 electrons and 19 protons with one valence electron in the outer shell. Potassium is considered chemically similar to sodium, the alkali metal above it on the periodic table. Under standard conditions potassium is a soft silvery-white metal. It is so soft that it can be easily cut with a knife.

Answer. Answer: Atomic number of k = 19, We see that, Pottasium(k) has 1 electron in it’s outermost shell, So k+ will have, 8 outermost electrons, According to Octet rule, K+ will be more stable !.

[Ar] 4s¹

Ernest Rutherford

Atoms of most elements are not able to exist independently. Atoms form molecules and ions. These molecules or ions aggregate in large numbers to form the matter that we can see, feel or touch.

Electrons are not little balls that can fall into the nucleus under electrostatic attraction. Rather,electrons are quantized wavefunctions that spread out in space and cansometimes act like particles in limited ways. An electron in an atom spreads out according to its energy. That’s why they not fall into the nucleus.

In electron capture, an atomic electron is absorbed by a proton in the nucleus, turning the proton into a neutron. But most atoms do not have too many protons, so there is nothing for the electron to interact with. As a result, each electron in a stable atom remains in its spread-out wavefunction shape.

Particles such as electrons can also become ‘entangled’, so that any measurement of the spin of one of them is correlated with the spin measured on the other – no matter how far apart they are! The SET allows only one electron to be added at a time, leaving the second electron of the pair free in the superconductor.