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the choices are:

A. They increase from left to right and top to bottom.

B. They increase from left to right and bottom to top.

C. They increase from right to left and top to bottom.

D. They increase from right to left and bottom to top.

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12y ago
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12y ago

As you go along the Periodic Table (either down or to the right) the Atomic Mass of the elements increase.

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11y ago

Generally increases down the group or across a period

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13y ago

On the average (with a few exceptions) mass increases, left to right on each row.

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12y ago

atomic mass doesn't follow a definite pattern. that's why Mendeleev's periodic table was rejected..

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13y ago

the atomic masses grow bigger per atom.

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10y ago

hvjvv

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Q: What happens to the atomic mass of elements as you move across and down the periodic table?
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Related questions

What happens to the atomic number as you go from left to right across the periodic table and why does this happen?

Periods on the periodic table refer to the rows of elements. As the elements progress to the right, the atomic numbers increase, usually in steps of 1.


O The periodic table of elements is the arrangement of elements according to?

The periodic table of elements is the arrangement of elements according to atomic number increasing from left to right across rows of the table.


What happens to the atomic radius when you go from left to right on the periodic table of elements?

The atomic radius decrease, with several exceptions in periods 6 and 5.


What happens to the reactivity of elements in groups as the atomic numbers increase across a period?

they become more reactive since you are moving from left to right on the Periodic Table, the elements in group 17 are the most reactive.


How much does the number increase by as you go across a row on the periodic table?

The atomic number increases by 1 as one go across a row on periodic table. The elements are arranged in order of increasing atomic number.


How much does the atomic number increase bye as you go across a row on the periodic table?

Atomic number increases by one as we move from left to right in a periodic table.


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 reactivity of elements in groups labeled a as atomic numbers increase across a period?

they become more reactive since you are moving from left to right on the Periodic Table, the elements in group 17 are the most reactive.


How did chemists organize the elements that were known?

Chemical elements are organized in the periodic table of Mendeleev.


Do the elements to the right of the periodic table have small or large radii?

Across a period the atomic size decreases. Hence elements in the right side of the periodic table have small size / radii.


What does the atomic number and atomic mass have to do with the arrangement of the elements on the periodic table?

The elements on the periodic table are arranged in order of increasing atomic number.


How are the size of the elements effected on the periodic table?

Atomic size increase down the group and decreases across the period.