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The 2 plus signs indicate that the calcium ion (Ca2+) has a charge of +2. This means that the calcium atom has lost 2 electrons, giving it a positive charge of 2. It is an ion that is positively charged and forms in certain chemical reactions.
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12 blackdrago98's answer: If the question is: "What is the answer to '2 plus 2 plus 4'?" then it is 8. If the question is: "What is the answer: 2(2+2+4)?"
In 1905, Albert Einstein published four revolutionary papers that significantly impacted the field of physics. These papers introduced the theory of special relativity, explained the photoelectric effect, proposed the existence of atoms, and derived the famous equation E=mc^2. The ideas presented in these papers laid the foundation for modern physics.
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