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Does increasing the number of protons increase atomic mass?
Does increasing atomic number equate to increasing mass?
Why do atoms get smaller as they move across the periodic table?
Why do atoms increase in size?
Why do atoms get smaller as you move down a group?
Why do different periodic tables give different atomic masses?
Jan 9, 2018 · The reason increasing atomic number doesn't always equate to increasing mass is because many atoms don't have the same number of neutrons and protons. In other words, several isotopes of an element may exist.
- Anne Marie Helmenstine, Ph.D.
Aug 14, 2020 · As we will discuss later on in the chapter, this phenomenon can explain the decrease in atomic radii we see as we go across the periodic table as electrons are held closer to the nucleus due to increase in number of protons and increase in effective nuclear charge.
Jun 20, 2015 · The atomic number increases moving left to right across a period and subsequently so does the effective nuclear charge. Therefore, moving left to right across a period the nucleus has a greater pull on the outer electrons and the atomic radii decreases.
Jun 26, 2023 · Mass Number. Experimental data showed that the vast majority of the mass of an atom is concentrated in its nucleus, which is composed of protons and neutrons. The mass number (represented by the letter A) is defined as the total number of protons and neutrons in an atom.
For atoms or ions that are isoelectronic, the number of protons determines the size. The greater the nuclear charge (# of protons), the smaller the radius in a series of isoelectronic ions and atoms. Therefore, largest to smallest we have: Se 2- > Br – > Kr > Rb + > Sr 2+
We know that mass increases as the atomic number increases, and depends primarily on the number of protons and neutrons in the atoms. So mass should increase across periodic table rows from left to right and down periodic table columns; experimental evidence supports this prediction.
The greater attraction between the increased number of protons (increased nuclear charge) and electrons, pulls the electrons closer together, hence the smaller size. As you move down a...
