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How is it possible that when adding protons while moving across a period the size of the atom actually shrinks why is the same trend not true as you move down a group?
Wiki User
∙ 15y ago
As you move across a period, from left to right, both the number of electrons and protons of a neutral atom increase. The increasing number of protons and electrons cause a greater attration between the nucleus (that contains the protons) and the electrons. This increased attraction pulls electrons closer to the nucleus, thus decreasing the size of the atom. Whereas, moving down a group, the number of energy levels increase. The increased number of energy levels cause the atom to become greater in size inspite of the increase in protons. The protons in the outermost energy levels are attracted to the nucleus, but the attraction is less because of the increase in distance from the nucleus.
Wiki User
∙ 15y ago
Wiki User
∙ 12y agoas you go along the Periodic Table, the nuclear mass of the element increases. this means that there is more gravitational attraction pulling the electrons inwards so the atomic radius decreases.
Wiki User
∙ 12y agoThe atom decreases in size going from left to right in the periodic table because of the addition of protons in the nucleus. The added protons in the nucleus provide a larger force in which to attract the electrons with. This makes the electrons pull in closer to the nucleus, reducing the size of the atom.
Wiki User
∙ 14y agoProtons are tiny compared to the size of an atom; adding protons adds mass, not volume.
Wiki User
∙ 13y agoBecause that's the way Dmitri Mendeleev organised the table.the atomic radius increases down the group because the electrons are added to new shell.
Wiki User
∙ 9y agoacross a period, atomic size reduces due to increase in nuclear charge. Down a group, number of shells increase and hence, atomic radius.
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Does atomic density increase or decrease as we go across in a period?
It decreases across a period. Since the atomic number increases, so does no. of protons and electrons. This makes the electrostatic force of attraction between electrons larger and hence the atom shrinks a bit. This makes the radius smaller.
As you move across a period of the periodic table from left to right what happens to the number of protons contained by each element?
I hate Chemistry!!!!!!!!!!!!!!!!!The number of protons increases as you go across a period.
If someone picks up an excess of electrons while walking across a carpet their charge would be?
negative protons are positively charged neutrons are neutral electrons are negative the masses of neutrons and protons are approximately equal and electrons, which "orbit" around the nucleus (the protons and neutrons) are much smaller mass-wise protons and electrons charges are equal and opposite
Why nuclear charge increases when atomic number increases across a period?
Atomic number is the number of protons in the nucleus. The higher the number the higher the nuclear charge
How does atomic radius increase or decrease horizontally or vertically across the periodic table?
Increases vertically as you add new shells, decreases horizontally because you have more protons in the nucleus
Does atomic density increase or decrease as we go across in a period?
It decreases across a period. Since the atomic number increases, so does no. of protons and electrons. This makes the electrostatic force of attraction between electrons larger and hence the atom shrinks a bit. This makes the radius smaller.
As you move across a period of the periodic table from left to right what happens to the number of protons contained by each element?
I hate Chemistry!!!!!!!!!!!!!!!!!The number of protons increases as you go across a period.
What ion is pumped across the inner membrane in the ETC?
Protons are pumped across the inner membrane into the intermembrane space.
How do elements changes as you across the periodic table?
the number of protons increases
What moves across the inner mitochondrial membrane to synthesize ATP during chemiosmosis?
protons
What happens to the periodic properties as you move across a period?
the mass increases, protons and electrons increase as well
Is it possible to have a triple rainbow across the sky?
no
Is a 16oz mixed grill the cooked weight or raw?
Meat is usually weighed when it's raw to get a more uniform form of measurement across the board. Meat shrinks when it's cooked.
How was it possible for Polynesian sailors to travel across vast expanses of ocean and not get lost?
How was it possible for Polynesian sailors to travel across vast expanses of ocean and not get lost?
The actual transport of protons by the proton pump is mediated by a transmembrane protein which undergoes a change in its?
If the protein is pumping protons, there should be an electrical gradient across the membrane as well as a proton concentration gradient.
Why does the ionsation energy graph doesn't grow at constant rate?
because the number of protons increase constant across the period
If someone picks up an excess of electrons while walking across a carpet their charge would be?
negative protons are positively charged neutrons are neutral electrons are negative the masses of neutrons and protons are approximately equal and electrons, which "orbit" around the nucleus (the protons and neutrons) are much smaller mass-wise protons and electrons charges are equal and opposite
