Magnesium has an atomic number of 12 and an atomic mass of 24. Which of the following statements is true of a neutral magnesium atom (no charge)? O It has 12 protons, 12 electron
Q: Which statements are true regarding the chemical formula Pb(NO3)4. Select the three that apply. The…
A: Pb(NO3)4 Lead(IV) nitrate Asked : 3 correct statements among given statements
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A: Salts are ionic compound, molecules ,electrolytes and dissociate in the presence of water.
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A: Atomic number is the proton number of a chemical element. It is represented by "Z".
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Q: 11
A: Ans- B
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- Polonium is a rare element with 33 radioisotopes. The most common one, 210Po, has 82 protons and 128 neutrons. When 210Po decays, it emits an alpha particle, which is a helium nucleus (2 protons and 2 neutrons). 210Po decay is tricky to detect because alpha particles do not carry very much energy compared to other forms of radiation. For example, they can be stopped by a single sheet of paper or a few inches of air. That is one reason that authorities failed to discover toxic amounts of 210Po in the body of former KGB agent Alexander Litvinenko until after he died suddenly and mysteriously in 2006. What element does an atom of 210Po become after it emits an alpha particle?Polonium is a rare element with 33 radioisotopes. The most common one, 210Po, has 82 protons and 128 neutrons. When 210Po decays, it emits an alpha particle, which is a helium nucleus (2 protons and 2 neutrons). 210Po decay is tricky to detect because alpha particles do not carry very much energy compared to other forms of radiation. They can be stopped by, for example, a sheet of paper or a few inches of air. This property is one reason why authorities failed to discover toxic amounts of 210Po in the body of former KGB agent Alexander Litvinenko until after he died suddenly and mysteriously in 2006. What element does an atom of 210Po decay into after it emits an alpha particle?The distribution of electrons across the shells of sulphur (atomic number = 16) is as follows (number of shells indicated with Roman numbers: number of electrons shown with Arabic numbers) 1-8, 11-8 1-2; 11 -4: III - 4 (1-4; || - 4; ||| - 8 () 1-2; 11 - 6; III - 8 (1-2; 11 - 8; II - 6
- Which of the following has the highest iodine content? Which of the following has the lowest melting point? Which of the following requires the fewest moles of hydrogen for complete hydrogenation? Which of these is likely to be solid at room temperature?The triple point of an element is at 75 torr and 125°C. This means that liquid is more dense than solid cannot exist at 1 atmosphere pressure cannot have a vapor pressure less than 75 torr cannot exist above 125 degrees Celsius What is the electron geometry (or electron arrangement) around an atom in a molecule or ion which is surrounded by three lone pairs of electrons and two single bonds T-shaped see-saw trigonal planar trigonal bipyramidal linear A red blood cell placed in pure water will swell because water moves from a higer osmotic pressure to a lower osmotic pressure the osmotic pressure is greater in the cell than in the water the osmotic pressure is the same in the cell and the water the somotic pressure is greater in the water than in the cellWhich statements are true regarding the chemical formula Pb(NO3)4. Select the three that apply. The formula unit has a ratio of four nitrate ion for every lead (IV) ion. Each Nitrogen atom is bonded with three oxygen atoms Formula unit contains more lead (IV) ions than nitrate ions. Each nitrate ion is bonded with four lead (IV) ions. Each formula unit has total of seventeen atoms
- The “octet rule” in chemistry helps predict the types of bonds thatatoms will form. In general, an atom will be most stable if it fills itsouter shell of 8 electrons. Atoms with fewer than 4 valence electronstend to donate electrons and those with more than 4 valence electronstend to accept additional electrons; those with exactly 4 can do both.Using this rule, determine what category each of the followingelements falls into: N, S, C, P, O, H, Ca, Fe, and Mg. (You will needto work out the valence of the atoms.)According to chemist John Dalton, if one mole of nitrogen is combined with three moles of hydrogen to form one mole of ammonia (knowing that nitrogen, with an atomic number of 7, has an atomic mass of 14, and hydrogen, with an atomic number of 1, has an atomic mass of 1), then this compound will have an atomic weight (or molecular mass) of: 14 grams per mole (14 daltons) 17 grams per mole (17 daltons) 20 grams per mole (20 daltons) 22 grams per mole (22 daltons) 43 grams per mole (43 daltons)An ion has 15 protons, 16 neutrons, and 18 electrons. The symbol for the ion is 31P3+. 31P3-. 31Ar3+. 34S+. 34S-.
- Which of the following substances is an element? salt O glucose water ironIf you are told you have an element with an atomic number of 16 and its in group VIA. What does this tell you about the number of protons, neutrons and electrons? What does it tell you about its valance electrons and will it tend to form anions or cations? Is it a metal or a nonmetal?Sucrose, C 12 H 22 O 11 , is table sugar or cane sugar. It can be decomposed by heat into carbon (a solid black mess) and water vapor. How many grams of carbon would be produced if you decomposed 10.0 g of sucrose? How many atoms of carbon would this be?