How Are Chlorine 37 and Calcium 40 Similar?

Chlorine 37 and calcium 40 are both atoms that have 18 electrons in their outermost shell. Both atoms also have 17 protons in their nucleus. The main difference between these two atoms is that calcium has 20 neutrons in its nucleus while chlorine has only 19. This means that calcium is slightly heavier than chlorine. Both atoms are found in nature, but chlorine is much more abundant than calcium.

The atomic number of an element is the number of protons in the nucleus of an atom of that element. The atomic number of chlorine is 17, and the atomic number of calcium is 20.

Chlorine is a chemical element with the symbol Cl and atomic number 17. It is the second-lightest halogen, and is a fuming yellow-green gas at room temperature. The element was first isolated by Carl Wilhelm Scheele in 1774.

Calcium is a chemical element with the symbol Ca and atomic number 20. As an alkaline earth metal, calcium is a reactive metal that forms a dark oxide-nitride layer when exposed to air. Its mass activities are intermediate between those of the heavier alkaline earth metals and the lighter ones.

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The electron configuration of chlorine is 3s23p63s23p5, and the electron configuration of calcium is 4s2. The outermost energy level of both atoms has 2 electrons in it, so they are both in the second energy level. The next level down has 3 electrons in it, so chlorine is in the third energy level and calcium is in the fourth energy level.

chlorine is the second most abundant halogen in the Earth's crust after fluorine, with an average concentration of 95 ppm in seawater and an abundance of 250 ppm in seawater. Calcium is the fifth most abundant element in the Earth's crust (4.1%), after oxygen, silicon, aluminum, and iron.

Chlorine is a chemical element with the symbol Cl and atomic number 17. The second-lightest of the halogens, it appears between fluorine and bromine in the periodic table and its properties are mostly intermediate between them. Chlorine is a yellow-green gas at room temperature and standard atmospheric pressure. It is an extremely reactive element and a strong oxidising agent: among the elements, it has the highest electron affinity and the third-highest electronegativity, behind only oxygen and fluorine.

Calcium is a chemical element with the symbol Ca and atomic number 20. As an alkaline earth metal, calcium is a reactive metal that forms a dark oxide-nitride layer when exposed to air. Its physical and chemical properties are most similar to its heavier homologues strontium and barium. It is the fifth most abundant element in Earth's crust and the third most abundant metal, after iron and aluminium. The most common calcium compound on Earth is calcium carbonate, found in limestone and the fossilised remains of marine organisms such as coral.

Chlorine is a halogen, and has a boiling point of −34.6 °C at standard pressure. Calcium is an alkaline earth metal, and has a boiling point of 1,542 °C at standard pressure.

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