Q: Q: What is electrons in the highest occupied principal energy level of an atom called? Read this paragraph and choose the correct option from the provided answers: In the study of chemical reactivity, we will find that the electrons in the outermost principal energy level are very important and so they are given a special name. Valence electrons are the electrons in the highest occupied principal energy level of an atom. In the second period elements listed above, the two electrons in the 1 s sublevel are called inner-shell electrons and are not involved directly in the element's reactivity or in the formation of compounds. Lithium has a single electron in the second principal energy level and so we say that lithium has one valence electron. Beryllium has two valence electrons. How many valence electrons does boron have? You must recognize that the second principal energy level consists of both the 2 s and the 2 p sublevels and so the answer is three. In fact, the number of valence electrons goes up by one for each step across a period until the last element is reached. Neon, with its configuration ending in s 2 p 6 , has eight valence electrons. Choices: - non-valence electrons - shell electrons - gradient electrons - valence electrons A:
A: valence electrons

Q: Q: Regularly done aerobic activities can help build up endurance and make what vital organ stronger? Read this paragraph and choose the correct option from the provided answers: Tim Wilson. Regularly done aerobic activities can help build up endurance and make the heart stronger . CC BY 2.0. Choices: - stomach - brain - skin - heart A:
A: heart

Q: Q: Around what percentage of the earth's surface water is contained in the ocean? Read this paragraph and choose the correct option from the provided answers: Oceans cover more than 70% of Earth's surface. Oceans hold 97% of the planet's surface water. It's no surprise that the oceans have a big influence on the planet. The oceans affect the atmosphere, climate, and living things. Choices: - 92 % - 99% - 86 % - 97% A:
A: 97%

Q: Q: What type of energy travels through matter in wave form? Read this paragraph and choose the correct option from the provided answers: Sound is a form of energy that travels in waves through matter. The ability to sense sound energy and perceive sound is called hearing . The organ that we use to sense sound energy is the ear. Almost all the structures in the ear are needed for this purpose. Together, they gather sound waves, amplify the waves, and change their kinetic energy to electrical signals. The electrical signals travel to the brain, which interprets them as the sounds we hear. Choices: - vibrational - magnetic - light - sound A:
A: sound