a) To determine the atomic number of element X, we look at the electronic configuration. The electronic configuration 2,8,7 indicates that there are 2 electrons in the first energy level, 8 electrons in the second energy level, and 7 electrons in the third energy level. Adding these numbers together, we get:

2 + 8 + 7 = 17

Therefore, the atomic number of element X is 17.

b) The number of valence electrons can be determined by looking at the outermost energy level. In this case, the outermost energy level is the third energy level, which contains 7 electrons. Therefore, element X has 7 valence electrons.

c) The valency of element X can be determined by looking at the number of valence electrons. In this case, element X has 7 valence electrons. Since the valency is determined by the number of electrons needed to complete the outermost energy level, element X needs 1 more electron to complete its outermost energy level. Therefore, the valency of element X is 1.

Question

a) To determine the atomic number of element X, we look at the electronic configuration. The electronic configuration 2,8,7 indicates that there are 2 electrons in the first energy level, 8 electrons in the second energy level, and 7 electrons in the third energy level. Adding these numbers together, we get:

2 + 8 + 7 = 17

Therefore, the atomic number of element X is 17.

b) The number of valence electrons can be determined by looking at the outermost energy level. In this case, the outermost energy level is the third energy level, which contains 7 electrons. Therefore, element X has 7 valence electrons.

c) The valency of element X can be determined by looking at the number of valence electrons. In this case, element X has 7 valence electrons. Since the valency is determined by the number of electrons needed to complete the outermost energy level, element X needs 1 more electron to complete its outermost energy level. Therefore, the valency of element X is 1.

Knowee AI · Accepted Answer

a) To determine the atomic number of element X, we look at the electronic configuration. The electronic configuration 2,8,7 indicates that there are 2 electrons in the first energy level, 8 electrons in the second energy level, and 7 electrons in the third energy level. Adding these numbers together, we get:

2 + 8 + 7 = 17

Therefore, the atomic number of element X is 17.

b) The number of valence electrons can be determined by looking at the outermost energy level. In this case, the outermost energy level is the third energy level, which contains 7 electrons. Therefore, element X has 7 valence electrons.

c) The valency of element X can be determined by looking at the number of valence electrons. In this case, element X has 7 valence electrons. Since the valency is determined by the number of electrons needed to complete the outermost energy level, element X needs 1 more electron to complete its outermost energy level. Therefore, the valency of element X is 1.

2. Electronic configuration of element X is 2,8,7a)write it's atomic numberb)find number of valance electronC) find valancy of X

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