Hardest Trivia Questions On Chemistry For 11th Grade

He2+ is a cation because it has a positive charge. Cations are formed when an atom loses electrons, resulting in a net positive charge. In the case of He2+, helium (He) has lost two electrons, leaving it with a +2 charge. The other options, O2-, Cl-, and Fl-, are anions because they have negative charges, indicating that they have gained electrons.

Protons are subatomic particles found in the nucleus of an atom. They carry a positive electric charge, which is equal in magnitude to the negative charge carried by electrons. This positive charge of protons is essential for maintaining the overall electrical neutrality of an atom, as the number of protons in an atom determines its atomic number and defines its identity as a specific element.

Electrons carry a negative electric charge. This is a fundamental property of electrons, which are subatomic particles that orbit the nucleus of an atom. The negative charge of electrons is equal in magnitude to the positive charge of protons, which are also present in the nucleus. This charge difference between electrons and protons creates the electrical forces that hold atoms together and allow for the flow of electric current in conductors.

Atoms are the smallest units of matter that retain the chemical properties of an element. They are the building blocks of matter and join together to form molecules through chemical bonds. Molecules, in turn, can be simple or complex and can include elements from different atoms. Therefore, the correct answer is "Building blocks of matter that join to form molecules."

Cations are ions that have a positive charge. In chemistry, ions are formed when atoms gain or lose electrons. When an atom loses one or more electrons, it becomes positively charged and is called a cation. Therefore, elements carrying positive charged ions are cations. Metals are often cations because they tend to lose electrons and form positive ions. On the other hand, elements carrying negative charged ions are called anions. None of the above options mentioned in the question are anions, hence the correct answer is "Elements carrying positive charged ion."

An ion is not a part of the components of an atom. Atoms are made up of three main components: protons, neutrons, and electrons. Protons and neutrons are found in the nucleus of the atom, while electrons orbit around the nucleus. Ions, on the other hand, are formed when an atom gains or loses electrons, resulting in a positive or negative charge. While ions are related to atoms, they are not considered a fundamental component of an atom itself.

The number of an element in the period is determined by the number of protons in its atom. This is because the number of protons in an atom, also known as the atomic number, determines the element's identity. Each element has a unique number of protons, which determines its place in the periodic table and its position in a specific period. Therefore, the correct answer is the number of protons in its atom.

Nuclear reactions can cause changes in the atomic nucleus. Unlike physical and chemical reactions, which involve changes in the arrangement of electrons or the physical state of matter, nuclear reactions involve changes in the nucleus itself. These reactions can result in the release of large amounts of energy and can lead to the formation of different isotopes or even different elements. Fission reactions, a type of nuclear reaction, involve the splitting of a heavy nucleus into two smaller nuclei, releasing a significant amount of energy in the process.

The correct answer is "Number of neurons." Isotopes are variants of an element that have the same number of protons but different numbers of neutrons. Therefore, the number of neutrons in an element's nucleus determines its isotope. The number of electrons and protons remains the same for all isotopes of an element.

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