Problem I When an atom gains or loses an electron an ion is formed. Answer the f

Question

Problem I When an atom gains or loses an electron an ion is formed. Answer the following questions for an ion with 14 electrons, 15 neutrons, and a+ charge. a How many protons does this ion have? b. Calculate the atomic mass of this ion, and show how you calculated the answer This is an ion of which element? For each of the following groups of elements: A Draw a molecule that could be made using these elements. When you draw your molecule, show the number of electrons in the outer shell of each element that you use. Show any transfer of electrons between elements and any sharing of electrons. B Label the bonds as either polar covalent, non-polar covalent or ionic and indicate whether there are any partial or full charges on any of the elements. Do not worry about whether the molecule is actually stable in nature, just try to fill the electron shells and determine the bond type from the electronegativities. You have to use all of the elements in your molecule, but you can use any element more than once. Problem 2 Element Atomic Number Chlorine17 Magnesium 12 Oxygen 8 Hydrogen 3.2 1.2 3.5 2.1 Problem 3 You must include a triple bond in your molecule. Element Atomic Number Electronegativity Osygen 8 Carbon 6 Nitrogen 7 Hydrogen I 3.5 2.5 2.1

Explanation / Answer

a. the number of protons is always equal to the number of electrons present in an atom. When an atom loses an electron and becomes an ion, the number of electrons decreases by one whereas the number of protons remain the same.

Hence this ion will have 14 protons.

b. Atomic mass of an atom is equal to the sum of number of protons and number of neutrons.

Atomic mass of ion= Number of protons+ number of neutrons

= 14+15 = 29

c. This is an ion of silicon, whose atomic number is 14.

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