0
Does atomic density increase or decrease as we go across in a period?
Wiki User
∙ 13y ago
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.
Wiki User
∙ 13y ago
Wiki User
∙ 13y agoIt increase....why?? Because...as u go across a period...u should know that one proton and electron are added to the atom...and by using the density formula D=M/V.....the increase in mass by the increase in number of protons and electrons....will result in increase in density.....
This is true for down the group and/or across the period for both metals and non-metals......
Wiki User
∙ 12y agoAtomic Mass increases across a period. If you know the basics about the Periodic Table then you know that as the atomic number increases across a period, the number of protons increases also. Since the protons and the neutrons have the most mass in an atom, as the amount of protons increases, the mass will also increase.
Wiki User
∙ 15y agoThe periodic table is organized by atomic number, so you start with 1 and end in 118. Moving across the periods (rows), atomic number increases by one.
Wiki User
∙ 14y agoIncrease
Add your answer:
Earn +20 pts
Does elements on the periodic table decrease in atomic size when you move across a period from left to right and when you move down a group?
1. In a period is a trend of decrease from left to right but it is not absolute.2. In a group the atomic radius increase moving down.
What accompanies an increase in atomic number within a specific period?
An increase in atomic number would be accompanied by a decrease in radius, and an increase in electronegativity.
What increases as you move up a column of the periodic table?
Electronegativity, ionization energy, electron affinity, and atomic number are values that increase from left to right across a period.
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
An increase in the atomic number the atomic radius moving from left to right across a period.?
decreases
Does elements on the periodic table decrease in atomic size when you move across a period from left to right and when you move down a group?
1. In a period is a trend of decrease from left to right but it is not absolute.2. In a group the atomic radius increase moving down.
Does an element on the periodic table decrease in atomic size when you move across a period from left to right and when you move down a group?
1. In a period is a trend of decrease from left to right but it is not absolute.2. In a group the atomic radius increase moving down.
What accompanies an increase in atomic number within a specific period?
An increase in atomic number would be accompanied by a decrease in radius, and an increase in electronegativity.
Why does atomic size increase from left to right across a period?
atomic size decreases across a period
Why does atomic size tend to decrease with increasing atomic number across a row of the periodic table?
electronegativity
What increases as you move up a column of the periodic table?
Electronegativity, ionization energy, electron affinity, and atomic number are values that increase from left to right across a period.
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
How does the atomic radius increase or decrease horizontally on the periodic table?
Atomic radius decreases horizontally in periodic table. This is due to increase in nuclear charge.
Does the atomic radius decrease as you move up a group and across a period from left to right on the periodic table?
the atomic radius decreses from left to right in periodic table due to increase in the number of succesive element the electrons of the outermost shell are more attracted towards nucleus and the atomic radius or atomic size decreases.
What is the trend in density in noble gases?
The densities of the noble gases increase with increasing molecular mass. The increase in density is due to the increase in atomic mass. Helium is about one seventh the density of air and can be used in balloons and lighter-than-air craft. Xenon is about five times the density of air.
Why does the density of group 2 metals increase?
The density of group 2 metals increases as you go up the group. This is because atomic radius decreases as you go up the group. Density is mass / volume and the ratio of mass to volume of atoms of the elements goes up with the decrease in radius.
An increase in the atomic number the atomic radius moving from left to right across a period.?
decreases
