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Explain why atomic radius generally decreases as you go left to right across a row on the periodic table?
Wiki User
∙ 13y ago
As you move from left to right across the Periodic Table, the number of protons in the nucleus of each successive atom increases by one. Correspondingly, the number of electrons also increases by one. However, if the elements in question are on the same energy level, the added ''pull" of the protons serves to pull the orbiting electrons closer to the nucleus, thus causing the radius of the atom to become smalller as you move from left to right. As you move down the Periodic Table, atoms get larger. As you move down the table, you continue to add protons and electrons. However, you also add energy levels and, in so doing, the orbiting (and available) electrons get further from the nucleus and the pull of the protons. It is the distance between protons and available electrons that allows the radius of the atoms to get larger. It also explains why reactivity increases as you go down the table. The pull of protons on the available electrons of small atoms is much greater than the pull of protons on the available electrons of large atoms, so the large atoms release their electrons much more readily.
Kip Strosin
Wiki User
∙ 13y agobecause the atom has one more proton and electron than the one before it.
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How does electronegative change going down and across the periodic table?
Electronegativity increases across (left to right) the periodic table and decreases on going down.
What is the periodic trend for elctronegativity?
Going down a group...electronegativity decreases Going across...electronegativity increases
Is the reactivity of the metal elements generally increase as you move from left to right across the periodic table true or false?
False,reactivity of elements generally decreases from left to right.As free electrons become less,reactivity decreases.So the given statement is false.
What is the general trend of ionization energy as you go across the periodic table?
Across a period, first ionization energy increases. However, when going down a group, first ionization energy generally decreases. As you go down a group, atoms hove more total electrons so they don't really care that much about their outermost ones.
Atomic size generally as you go down a group?
Atomic size generally increases as you go down a group
How does electronegative change going down and across the periodic table?
Electronegativity increases across (left to right) the periodic table and decreases on going down.
What decreases across the periodic table?
Atomic size decreases across a period
What generally decreases across the periodic table from sodium to chlorine?
the number of available electron spaces in the outer electron shell.
When you go across the periodic table how does the atomic size go?
Atomic size decreases across the rows of the periodic table
How does the atomic raduis change across a period of the periodic table?
Atomic radius usually decreases from left to right across a period of the periodic table.
Does atomic size increase from left to right across the periodic table?
it decreases
What happen if you move left to right a across a periodic table in metals?
Across a period the metallic character decreases
Does electropositivity increases or decreases as you move left to right across a period on the periodic table?
Electropositivity decreases along a period. The metallic character also decreases.
What is an example of periodicity?
A good example of periodicity would be the size of an atom which decreases across the Periodic Table but increases down the column
WHAT BEST STATES THE TREND IN ATOMIC RADIUS ACROSS THE PERIODIC TABLE?
As you move across the periodic table from left to right (across a period), the atomic radius of the elements tends to decrease.
What happens to the melting temperature as you go from left to right across a row in the periodic table?
it increases then decreases
What is the periodic trend for elctronegativity?
Going down a group...electronegativity decreases Going across...electronegativity increases
