Question

1. which of the following statements are not true about electron dot diagrams? they only show valence electrons they are the same for all elements in the same group they include all electrons in an atom each dot represents one electron 4) an atom of a certain element has the electron configuration of ar4s2 3d10 4p5. how many valence electrons does this element have? 7 10 17 2 5

Explanation:

Step1: Recall electron - dot diagram concept

Electron - dot diagrams only show valence electrons, each dot represents one valence electron, and elements in the same group have the same number of valence electrons so similar electron - dot diagrams. They do not show all electrons in an atom.

Step2: Analyze question 3 options

The statement "They include all electrons in an atom" is false for electron - dot diagrams.

Step3: Recall valence - electron concept for question 4

For the electron configuration [Ar]4s²3d¹⁰4p⁵, valence electrons are in the outermost shell. Here, the outermost shell is the 4th shell with 2 electrons in 4s and 5 electrons in 4p. So the number of valence electrons is 2 + 5=7.

Answer:

1. They include all electrons in an atom
2. 7