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 option 7

Explanation:

Step1: Recall electron - dot diagram concept

Electron - dot diagrams only show valence electrons, with each dot representing one valence electron. Elements in the same group have the same number of valence electrons and similar electron - dot diagrams.

Step2: Analyze each option for question 3

• "They only show valence electrons": True.
• "They are the same for all elements in the same group": True.
• "They include all electrons in an atom": False. Electron - dot diagrams only show valence electrons.
• "Each dot represents one electron": True.

Step3: Recall valence - electron concept for question 4

For electron configuration [Ar]4s²3d¹⁰4p⁵, the valence electrons are in the outermost shell (n = 4 here). The number of electrons in 4s (2) and 4p (5) sub - shells are valence electrons. So, 2+5 = 7.

Answer:

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