As you move left to right,
the atomic radius
What happens to elements as you move across the periodic table in a period?
Elements in the same period have the same number of electron shells; moving across a period (so progressing from group to group),
elements gain electrons and protons and become less metallic
. This arrangement reflects the periodic recurrence of similar properties as the atomic number increases.
What happens when you move from left to right on the periodic table?
Electron affinity increases
from left to right across the periodic table. This is caused by the decrease in atomic radius. As we already explained, moving from left to right across a period, atoms become smaller and smaller as the atomic number increases.
Does atomic size increase left to right?
The atomic radius of atoms
generally decreases from left to right across
a period. The atomic radius of atoms generally increases from top to bottom within a group.
Does the atomic mass increase from left to right?
Explanation: As you go from left to right in the Periodic Table, you are adding more protons and neutrons to the nuclei. … Therefore, atomic mass
increases from left to right
and from top to bottom of the Periodic Table.
Which element is most essential for life?
Oxygen
.
Oxygen
is the most abundant element contained within living organisms, composing about 65% of the human body. Oxygen is also the most abundant element in the Earth’s crust, and in the air that is essential for most life on Earth.
Does the atomic mass increase by one as you move across a period?
Explanation: As you move across a period, the
atomic mass increases
because the atomic number also increases. … The atomic mass for any given atom mainly comes from the mass of the protons and neutrons.
What is the trend in EA across a period?
Electron affinity generally
increases across
a period in the periodic table and sometimes decreases down a group. These trends are not necessarily universal. The chemical rationale for changes in electron affinity across the periodic table is the increased effective nuclear charge across a period and up a group.
What element in the second period has the largest atomic radius?
Answer: In the second period of modern periodic table
Lithium (Li)
is the element with largest atomic radius.
Why does atomic size increase down a group and decrease left to right?
Experiments have shown that the first case is what happens:
the increase in nuclear charge overcomes the repulsion between the additional electrons in the valence level
. Therefore, the size of atoms decreases as one moves across a period from left to right in the periodic table.
What element has the largest atomic radius?
Atomic radii vary in a predictable way across the periodic table. As can be seen in the figures below, the atomic radius increases from top to bottom in a group, and decreases from left to right across a period. Thus, helium is the smallest element, and
francium
is the largest.
What is the rule of atomic mass?
To calculate the atomic mass of a single atom of an element,
add up the mass of protons and neutrons
. … You can see from the periodic table that carbon has an atomic number of 6, which is its number of protons. The atomic mass of the atom is the mass of the protons plus the mass of the neutrons, 6 + 7, or 13.
What is the trend for atomic mass?
The atomic number increases across a period and down the group or family. The atomic mass
generally increases with atomic number with
a few exceptions.
Which group has the highest metallic character?
Metallic character increases form right to left across a period on the periodic table, and from top to bottom down a group. The
alkali metals in group 1
are the most active metals, and cesium is the last element in the group for which we have experimental data.
What is the most useful element?
Silicon
is one of the most useful elements to mankind.
What are the six essential elements of life?
The six most common elements of life on Earth (including more than 97% of the mass of a human body) are
carbon, hydrogen, nitrogen, oxygen, sulphur and phosphorus
.
