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Nov 18, 2020 · When an ion has a positive charge, the atom has lost electrons. To calculate the remaining number of electrons, you subtract the amount of extra charge from the atomic number. In the case of a positive ion, there are more protons than electrons. For example, Ca 2+ has a +2 charge so it has lost 2 electrons from the neutral state. Calcium’s ... For a neutral atom, the number of protons is exactly equal to the number of electrons. So the number of electrons is the same as the atomic number. However, it is possible to remove electrons and not change the identity of an element. These are called ions. The charge on the ion tells you the number of electrons. Hence a chlorine atom has 17 protons and 17 electrons. The first shell (n = 1) can only hold electrons while the second shell (n = 2) holds eight. Hence, ten electrons are held in the first two shells. The remaining seven electrons must go into the third shell (n = 3). Isobars differ in atomic number (or number of protons) but have the same mass number. Here both M and N have equal number of proton and neutron but M contains more electrons than N thus N must be the cation of M.
If the atom has more electrons than protons, it is a negative ion, or ANION. If it has more protons than electrons,it is a positive ion. What is an atom? How could something as small as an atom move a space craft?
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When the charge on an atom is zero it means the number of protons is equal to the number of electrons. The atom is said to be neutral and there will not be a + or - written after the element symbol. When an atom loses electrons it becomes a positive ion (called a cation). For example, when Lithium-7 (Li) loses an electron it becomes Li +. Only ... Eva plus tv.
Sometimes electrons tend to spend more time with one atom in the bond than with the other. In such cases a polar covalent bond develops. Water (H 2 O) is an example. Since the electrons spend so much time with the oxygen (oxygen having a greater electronegativity, or electron affinity) that end of the molecule acquires a slightly negative charge.