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प्रश्न
Which of the following have inert gases 2 electrons in the outermost shell.
विकल्प
He
Ne
Ar
Kr
उत्तर
He
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संबंधित प्रश्न
Write the electronic configuration of two elements X and Y whose atomic numbers are 20 and 17 respectively. Write the molecular formula of the compound formed when element X reacts with element Y. Draw the electron-dot structure of the product and also state the nature of the bond formed between both the elements.
Rewrite the following statement after correction, if necessary:
Groups have elements with consecutive atomic numbers.
The element which forms a basis oxide has the atomic number of:
(a) 18
(b) 17
(c) 14
(d) 19
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(i) What type of chemical bond is formed?
(ii) Give the formula of the compound formed.
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(a) What are X, Y and Z?
(b) To which group of periodic table does X belong?
(c) Name the periodic table in which X is placed.
(d) Which element is placed just before X in the period?
(e) Which element is placed just after X in the period?
Moseley’s periodic table is based on atomic mass.
An element X combines with oxygen to form an oxide XO. This oxide is electrically conducting. Write the formula of the compound formed when X reacts with chlorine.
Which type of elements are poor conductors of heat and electricity?
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Complete the following triads by inserting the missing elements.
Li, ______, K
