Determine the number of protons and the number of electrons in each ion. d. Sr²⁺

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Identify the atomic number of the element Sr (Strontium) from the periodic table, which is 38.

The atomic number represents the number of protons in a neutral atom, so Sr has 38 protons.

For a neutral atom, the number of electrons equals the number of protons. Therefore, a neutral Sr atom also has 38 electrons.

The ion Sr^{2+} indicates that the strontium atom has lost 2 electrons.

Subtract 2 from the original number of electrons (38) to find the number of electrons in Sr^{2+}, which is 36.

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Atomic Structure

Atoms consist of protons, neutrons, and electrons. Protons are positively charged particles found in the nucleus, while electrons are negatively charged and orbit the nucleus. The number of protons defines the element, and in a neutral atom, the number of electrons equals the number of protons.

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02:10

Atom Structure

Ions

Ions are atoms or molecules that have gained or lost one or more electrons, resulting in a net charge. A cation, like Sr2+, has lost electrons, leading to a positive charge. The charge of the ion indicates how many electrons have been lost or gained compared to the neutral atom.

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Ion Formation

Strontium (Sr) Properties

Strontium is an alkaline earth metal with an atomic number of 38, meaning it has 38 protons in its neutral state. When it forms the Sr2+ ion, it loses two electrons, resulting in a total of 36 electrons. Understanding the properties of strontium helps in determining the electron configuration and charge of its ions.

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