Element A has an atomic number of 20 while element B has an atomic number of 7.After bonding, the chemical formula is AxBy What is the value of x?
Question
Element A has an atomic number of 20 while element B has an atomic number of 7.After bonding, the chemical formula is AxBy What is the value of x?
Solution
The atomic number of an element represents the number of protons in its nucleus, and also typically indicates the number of electrons around the nucleus when the element is in its neutral state.
In this case, Element A has an atomic number of 20, which means it has 20 protons and, when neutral, 20 electrons. Element B has an atomic number of 7, meaning it has 7 protons and, when neutral, 7 electrons.
When elements bond to form compounds, they do so in a way that allows them to achieve a stable electron configuration. Most elements aim to have 8 electrons in their outermost shell, a state known as the "octet rule".
Element A, with 20 electrons, has 2 in the first shell, 8 in the second, 8 in the third, and 2 in the fourth. To achieve a stable configuration, it would want to lose those 2 electrons in the fourth shell.
Element B, with 7 electrons, has 2 in the first shell and 5 in the second. To achieve a stable configuration, it would want to gain 3 electrons to fill its second shell.
Therefore, for every atom of Element A, you would need three atoms of Element B to balance out the electron transfer. This would give you a chemical formula of A1B3.
So, the value of x in the formula AxBy is 1.
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