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Within a horizontal row, mass of the elements increases as you go to the right. This is because as the atomic number increases, so does the number of protons and electrons.
This means that the total mass of the atom also increases because protons weigh approximately 1 Atomic Mass unit.
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LaoGenerally a single element's mass will change (and stay the same element) only if the number of neutrons changes in the nucleus. Although an element's mass does change by the loss of electrons, it is exceptionally negligible. Should an element change in mass by losing a proton, it then becomes a different element entirely.
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What are the horizontal rows on the periodic table?
The rows (Horizontal) are called Periods and the Columms (Vertical) are called Groups.
What are the horizontal groupings in the periodic table named?
The horizontal lines are called "periods" and show how many "shells" each atom hasThe horizontal rows in the periodic table are called periods. The vertical columns are called groups.
The elements of the Periodic Table are arranged in horizontal rows according to each successive element's greater?
number of protons
What is a chart that lists all the known elements?
It is called the Periodic Table of Elements.
What is significant about the elements within the same period of the periodic table?
They have similar chemical properties.
