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How many electrons are present in the ou...

How many electrons are present in the outermost orbit of helium?

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To determine how many electrons are present in the outermost orbit of helium, we can follow these steps: ### Step-by-Step Solution: 1. **Identify the Element**: We are looking at helium (He), which is a chemical element. 2. **Find the Atomic Number**: The atomic number of helium is 2. The atomic number indicates the number of protons and, in a neutral atom, it also indicates the number of electrons. ...
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ICSE-PERIODIC PROPERTIES OF ELEMENTS -QUESTIONS FOR PRACTICE (Answer the questions in one word or in one sentence:)
  1. How many groups are there in the modern periodic table?

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  2. Name the first element of group 13.

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  3. Potassium belongs to which period of the periodic table?

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  4. Calcium belongs to which group of the periodic table?

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  5. How many electrons are present in the outermost orbit of helium?

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  6. How many shells are there in an atom of silicon?

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  7. Name the element which belongs to group 17 and period 2 of the modern ...

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  8. What is the common name of the elements of group 1?

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  9. What is the general name of the elements of group 17?

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  10. To which group of the modern periodic table do alkaline earth metals b...

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  11. Which one of Li and F has larger atomic radius?

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  12. Which one of Li and K has larger atomic size?

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  13. How does valency change within a group of the periodic table?

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  14. Which one of F and Cl is more electronegative?

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  15. Which one of F and Cl has larger electron affinity?

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  16. What is the trend in the atomic size in a group, does it increase or d...

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  17. State modern periodic law of classification of elements.

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  18. Who proposed that atomic number is the fundamental property of an elem...

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  19. Which one of Mg and Ca is more metallic?

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  20. From the electronic configurations N (2,5), O (2,6) and F (2,7), answe...

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