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Write equations for the loss of an electron by a K atom and the gain of an electron by a K+ ion.
2. Atoms and the Periodic Table
Ions (Simplified)
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Which of the following is the symbol for the ion with a +4 charge, 30 neutrons and 21 electrons?
A
55Mn4+
B
51Cl4+
C
51Mn4+
D
58Ni4+
Verified step by step guidance1
Identify the number of protons in the ion. Since the ion has 21 electrons and a +4 charge, it originally had 25 electrons (21 + 4 = 25). Therefore, the ion has 25 protons.
Determine the element based on the number of protons. The atomic number, which is the number of protons, identifies the element. An atomic number of 25 corresponds to manganese (Mn).
Calculate the mass number of the ion. The mass number is the sum of protons and neutrons. With 25 protons and 30 neutrons, the mass number is 25 + 30 = 55.
Write the symbol for the ion. The chemical symbol for manganese is Mn, and with a mass number of 55 and a +4 charge, the ion is represented as 55Mn4+.
Verify the options given in the problem. The correct symbol for the ion with a +4 charge, 30 neutrons, and 21 electrons is 55Mn4+.
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