Neutron stars are composed of solid nuclear matter, primarily neutrons. Assume the radius of a neutron is approximately 1.0 * 10 - 13 cm. Calculate the density of a neutron. [Hint: For a sphere V = (4>3)pr3.] Assuming that a neutron star has the same density as a neutron, calculate the mass (in kg) of a small piece of a neutron star the size of a spherical pebble with a radiusof 0.10 mm.

An atom has a diameter of 2.50 Å and the nucleus of that atom has a diameter of 6.00 x 10-5 Å. Determine the fraction of the volume of the atom that is taken up by the nucleus. Assume the atom and the nucleus are a sphere. fraction of atomic volume: Calculate the density of a proton, given that the mass of a proton is 1.0073 amu and the diameter of a proton is 1.69 × 10-¹5 density: m. g/cm³

● In the space below, use X for the symbol of an element, Z for the atomic number and A for the mass number to write a general nuclide symbol.

What is the symbol of the element in Group 4A(14) and Period 2?

The radius of a tantalum atom is 142 pm. How many tantalum atoms would have to be laid side by side to span a distance of 1.87 mm? atoms

The radius of a strontium atom is 215 pm How many strontium atoms would have to be laid side by side to span a distance of 1.65 mm?

88 and 89 please

A robot spacecraft returned samples from the planetesimal 98765 ALEKS, located in the outer Solar System. Mass-spectroscopic analysis produced the following data on the isotopes of ruthenium in these samples: isotope 104 Ru 96 Ru mass relative (amu) abundance 103.9 51.% 95.9 Ru 49.% Use these measurements to complete the entry for ruthenium in the Periodic Table that would be used on 98765 ALEKS. Be sure your answers have the correct number of significant digits. Caution: your correct answer will have the same format but not necessarily the same numbers as the entry for ruthenium in the Periodic Table we use here on Earth. X