There are 14 protons in 29Si. All isotopes and ions of the same elements will have the same number of protons regardless of the difference in the number of neutrons or electrons. So the information about which isotope is (by saying silicon-29) is unneeded.
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Silicon-27 has 14 protons (since it is silicon) and 13 neutrons, as the atomic number (proton number) minus the mass number (proton number + neutron number) gives the number of neutrons. In this case, 27 - 14 = 13 neutrons.
The average atomic mass of silicon is around 28.09 atomic mass units. This is due to the natural abundance of the three silicon isotopes: silicon-28, silicon-29, and silicon-30. Silicon-28 is the most abundant isotope at about 92.23%, followed by silicon-29 at about 4.67%, and silicon-30 at about 3.1%.
Some common isotopes of silicon include Silicon-28, Silicon-29, and Silicon-30. Silicon-28 is the most abundant and stable isotope, while Silicon-29 and Silicon-30 are stable but less prevalent isotopes.
Silicon has 14 protons which are positively charged and 14 electrons which are negatively charged. This balanced number of protons and electrons gives silicon an overall neutral charge.
The silicon-29 isotope is used extensively in Nuclear Magnetic Resonance or NMR spectroscopy. It has 14 electrons, 14 protons and 15 neutrons.