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Which chemical element has the atomic number 17?
Oxygen
Chlorine
Fluorine
Argon
Chlorine
Chlorine is the chemical element with the atomic number 17, placing it in Group 17 (the halogens) of the periodic table. Its electron configuration is 1s22s22p63s23p5, meaning it has 17 protons in its nucleus.
Chlorine is the chemical element with the atomic number 17, placing it in Group 17 (the halogens) of the periodic table. Its electron configuration is 1s22s22p63s23p5, meaning it has 17 protons in its nucleus.
Think of chlorine as an 'electron-hungry' collector; it is just one piece away from completing its set of 8, making it very eager to 'borrow' or share an electron from other elements like Sodium.
For the first few halogens (F, Cl, Br, I), remember: 'Fast Clowns Bring Interesting toys'.
1s22s22p63s23p5 тАФ Electron configuration of Chlorine
Cl+eтИТтЖТClтИТ тАФ Formation of chloride ion
The atomic number represents the total number of protons in the nucleus of an atom. In a neutral chlorine atom, the 17 protons are balanced by 17 electrons. Because it has 7 valence electrons, it is highly reactive and tends to gain one electron to achieve a stable octet, forming the chloride ion ClтИТ.
Chlorine belongs to the halogen group (Group 17).
It exists primarily as a diatomic gas, Cl2тАЛ, at standard temperature and pressure.
It is a strong oxidizing agent due to its high electronegativity.
Widely used as a disinfectant in water treatment to kill bacteria.
Essential in the production of PVC plastic.
Chlorine gas is highly toxic and was historically used as a chemical weapon.
Causes severe irritation to respiratory systems if inhaled.
Water purification in swimming pools and municipal systems.
Bleaching agent in paper and textile industries.
Standard atomic mass is approximately 35.45 u.
Option A (Oxygen) has atomic number 8.
Option C (Fluorine) has atomic number 9.
Option D (Argon) has atomic number 18.
B is correct тАФ Chlorine is the element defined by the presence of exactly 17 protons in its atomic nucleus.
Always remember that elements in the same vertical column (group) share similar chemical properties; chlorine shares properties with fluorine, bromine, and iodine.
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