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Which of the following statements is/are correct? 1) Conductor contains a large number of electrons in the conduction band at room temperature. No energy gaps exist and the valence and conduction bands overlap. 2) A semiconductor is a material in which the energy gap is so large that practically no electron can be given enough energy to jump this gap. 3) An insulator is a solid with an energy gap small enough for electrons to cross rather easily from the valence band to conduction band.
Which of the following points are correct regarding the electronic configuration? A. It is the arrangement of electrons in the shells of an atom. B. It is the arrangement of electrons in the subshells. C. It is the arrangement of electrons in the orbitals of an atom.
How many valence electrons are there in an atom of phosphorus?
Anything that influences the valence electrons will affect the chemistry of the element. Which one of the following factors does not affect the valence shell?
In the question two statements are given, followed by two conclusions, I and II. You have to consider the statements to be true even if it seems to be at variance from commonly known facts. You have to decide which of the given conclusions, if any, follows from the given statements. Statement I: No electron is proton. Statement II: All protons are atom. Conclusion I: Some electrons are atoms. Conclusion II: No electrons are atom.
According to Thomson's model of an atom: 1. An atom consists of a positively charged sphere and the electrons are embedded in it. 2. The negative and positive charges are not always equal in magnitude. So, the atom as a whole is not always electrically neutral. Choose the correct code:  
Which of the following options are correct? 1. Three carbon atom is indicated by 'prop'. 2. Four carbon atom is indicated by 'but'. 3. Seven carbon atom is indicated by 'Hex'. 4. Nine carbon atom is indicated by 'Non'.
Directions : For the Assertion (A) and Reason (R) below, choose the correct alternative Assertion(A) : Graphite is slippery and used as a lubricant. Reason (R) : Graphite has free electrons.
How many valence electrons does an oxygen atom have? A. 2 B. 6 C. 8 D. 16
How may valence electrons does a silicon atom have?