Question

Use the portion of the periodic table shown below to answer the questions. A portion of the first three columns of the periodic table is shown. Column one from top to bottom reads 11 sodium 22.990, 19 potassium 39.098, and 37 rubidium 85.468. Column two reads 12 magnesium 24.305, 20 calcium 40.078, and 38 strontium 87.62. Column three reads 21 scandium 44.956 and 39 yttrium 88.906. Part 1: Name two elements that have the same properties as sodium (Na). (2 points) Part 2: Determine the number of protons, electrons, and neutrons present in an atom of calcium (Ca). Explain how you determined your answer using complete sentences. (6 points)

Answer 1

Answer:

Part 1: Potassium (K), and Rubidium (Rb).

Part 2: Calcium (Ca) has 20 protons and 20 electrons

Explanation:

Part 1: Elements in a same column share a great deal of propreties, in this list Potassium (K), and Rubidium (Rb) are the elements that lies in the same column as Sodium (Na).

Part 2: Calcium (Ca) has 20 protons and 20 electrons. The First information is given by the periodic table, because it is organized in a way that it shows atomic number (proton number) and atomic mass and sometimes some more information about the elements. Atoms are eletricaly neutral, so there must exist 20 electrons within Calcium's orbitals to compensate its 20 protons.

A portion of a periodic table is attached.

Answer 2

Part 1: Potassium, and Rubidium.Part 2: Calcium has 20 protons and 20 electrons because the atomic number for calcium is 20 and that determines how many protons there are and in an atom, the number of protons is the same number of electrons. Calcium has about 20 neutrons. I got the number of Neutrons by subtracting the mass number(40.078) and the atomic number(20), I got 20.078. Round to the nearest whole number because you cannot have half or partial neutron. So, Calcium has 20 protons, 20 electrons, and 20 neutrons,
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