Why does electronegativity increase across a period in the periodic table?

Related questions

1. What is true electronegativity?
2. Why do metals have low electronegativity?
3. Which atoms are the most electronegative?
4. What is electronegativity according to Pauling?
5. What is electronegativity in simple words?
6. What is the SI unit of electronegativity?
7. Why does helium have no electronegativity?
8. Does electronegativity have a unit?
9. Do Metals have low or high electronegativity?
10. What is Electropositivity and electronegativity?

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1. #energy
2. #period
3. #positive
4. #table
5. #electronegativity
6. #negative
7. #electrons
8. #creating
9. #though
10. #periodic
11. #number
12. #protons
13. #because
14. #nucleus
15. #shell
16. #levels
17. #outer
18. #across
19. #right
20. #increases
21. #stronger
22. #there