Why does the size of an atom decrease as you move to the right across rows on the periodic table?
Atomic size gradually decreases from left to right across a period of elements. This means that the nucleus attracts the electrons more strongly, pulling the atom’s shell closer to the nucleus. The valence electrons are held closer towards the nucleus of the atom. As a result, the atomic radius decreases.
Which elements have the smallest radius?
Helium has the smallest atomic radius. This is due to trends in the periodic table, and the effective nuclear charge that holds the valence electrons close to the nucleus. Atomic radius decreases as you move across a period from left to right and decreases as you move up a group from bottom to top.
Which element has smallest atomic radius?
helium
Which one of the following is correct order of increase in size?
Na + < F -< Al < Mg is the order of increase in size.
Which is bigger F or Na+?
Answer. Explanation: The ionic radius of fluoride ion is bigger then that its parent atom. This is because when fluorine atom gains an electron number of electrons becomes more than the number of protons due to which effective nuclear charge on valence electrons decreases and resulting in increase in size of an ion.
Which one has largest size Na+ f/f n?
Na,Na+,N,F – Brainly.in….Answer:
- F is largest in size because anions are larger than its parent atom.
- But since in it its valence shell has not filled, therefore it is less stable.
- Hence , Na is largest stable atom in these.
Why is Na bigger than F?
Na+ has smaller size than F- because both Na+ and F- have equal number of electrons i.e.10 . After losing an electron Na will have less electron cloud and more effective nuclear charge whereas F after gaining an electron will have less effective nuclear charge than the parent atom so the size increases .
Which ion is smallest?
Consequently, the ion with the greatest nuclear charge (Al 3 +) is the smallest, and the ion with the smallest nuclear charge (N 3−) is the largest….Ionic Radii and Isoelectronic Series.
| Ion | Radius (pm) | Atomic Number |
|---|---|---|
| N 3− | 146 | 7 |
| O 2− | 140 | 8 |
| F − | 133 | 9 |
| Na + | 98 | 11 |