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One isotope of a metallic element has a mass number of 65 and 35 neutrons in the nucleus. The cation that this atom forms has 28 electrons. What is the symbol of the cation?
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2. Atoms & Elements
Ions
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Which of the following would most likely form an anion with a 2– charge?
A
K
B
Ca
C
Sc
D
Se
E
Br
F
Kr
Guida verificata passo dopo passo1
Step 1: Understand the concept of anions. Anions are negatively charged ions formed when an atom gains electrons. The charge of the anion is determined by the number of electrons gained.
Step 2: Identify the group in the periodic table where elements typically form anions with a 2- charge. Elements in Group 16 (the oxygen group) often form anions with a 2- charge because they tend to gain two electrons to achieve a stable electron configuration.
Step 3: Examine the elements provided in the problem: K (Potassium), Ca (Calcium), Sc (Scandium), Se (Selenium), Br (Bromine), and Kr (Krypton). Determine which of these elements belong to Group 16.
Step 4: Recognize that Selenium (Se) is in Group 16 of the periodic table. Elements in this group typically gain two electrons to form anions with a 2- charge.
Step 5: Conclude that Selenium (Se) is the element most likely to form an anion with a 2- charge, based on its position in the periodic table and its tendency to gain electrons.
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