Radon's atomic number is 86. Therefore, were it electrically neutral, radon would have 86 protons and 86 electrons. Since we're talking about Rn-1 though, we need to add an electron to that, bringing the total to 87.
Radon not really can form an ion. This is because it is in the group 0, which is the inert/noble gases group. In this group all gases have a full octet which prevents them from reacting with other substances and so preventing them to have an ion. Group 1 has an ion of +1 as it has one electron in the valence shell while nothing such as +8 or -8 exists yet! Happ to help ;).
Radon has eight valence electrons. It's a noble gas, meaning that it does not react well with other elements.
A potassium ion (K+) has 18 electrons. Potassium has 19 electrons in its neutral state, but when it loses one electron to become an ion, it has 18 electrons.
Chlorine will not for Cl-7 ion. It will form Cl-1 ion, which has total of 18 electrons.
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Radon not really can form an ion. This is because it is in the group 0, which is the inert/noble gases group. In this group all gases have a full octet which prevents them from reacting with other substances and so preventing them to have an ion. Group 1 has an ion of +1 as it has one electron in the valence shell while nothing such as +8 or -8 exists yet! Happ to help ;).
Radon has eight valence electrons. It's a noble gas, meaning that it does not react well with other elements.
A neutral atom has an equal number of protons and electrons. Protons are positively charged, and electrons are negatively charged. Therefore if you have an ion with a -1 charge, it has one extra electron. So your ion has 85 protons.
A potassium ion (K+) has 18 electrons. Potassium has 19 electrons in its neutral state, but when it loses one electron to become an ion, it has 18 electrons.
Chlorine will not for Cl-7 ion. It will form Cl-1 ion, which has total of 18 electrons.
A cesium ion with a +1 charge (Cs+) has lost one electron. Cesium (Cs) normally has 55 electrons, but the Cs+ ion has 54 electrons.
A chlorine ion is monatomic ― it is just Cl-.
A 37Cl ion with a charge of 1+ has 18 electrons. This is because the neutral chlorine atom has 17 electrons, and since the ion has a positive charge of 1, it has lost 1 electron, resulting in a total of 18 electrons.
A chloride ion has gained one electron to become a Cl- ion, making it uncharged overall but with 18 electrons to match the 17 protons in its nucleus.
Potassium will lose 1 electron to form a 1+ ion.
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A neutral atom has an equal number of protons and electrons. Protons are positively charged, and electrons are negatively charged. Therefore if you have an ion with a -1 charge, it has one extra electron. So your ion has 85 protons.