Write the complete atomic symbol (AS) of the following isotopes, indicating Z (a
ID: 716547 • Letter: W
Question
Write the complete atomic symbol (AS) of the following isotopes, indicating Z (atomic number) and A (mass number) appropriately a. Atom with 78 electrons, 117 neutrons 15-787 78A195 b. Polonium-210 Let us suppose we want to find out if the king's crown is made of gold. The mass of the crown is 450 g. The volume of the crown is 20 cm* (measured by immersion in a liquid). The density of pure gold is 19.3 glem. Is the crown made of pare gol? 8. D The density of the crown is: de-450g/20em2-23 g/em This is different from the density of pure gold: d-19.3 g/em Therefore the crown is not made of pure gold Nitrogen is a gas at room temperature (we breath it). It has a boiling point b,--196 C and melting point m,-210 °C. What is its physical state of matter at the following temperatures (and the same pressure)? (Hint solid, liquid, gas; turn all 9. res in C and use the axis provided) LEAR a. 0°C (gas) b. 398 K-124.85 °C (gas) . 200 °C (gas) d. 10 K--263.15 °C (solid) e. -195 °C (gas) 200 °C 124.85 °C -195 °C -196 m,-210 C -263.15 °CExplanation / Answer
7) The atomic number corresponds to the number of protons with which an atom has, if said atom is electrically neutral, the atomic number also coincides with the number of electrons. The number of neutrons is what determines the difference between the isotopes of the same atom and influences its weight, therefore, it is also reflected in the mass number.
8) Calculating the density of the crown, from its weight and its volume, is compared with the value given, if they are equal, the crown is made of pure gold, if they are different, it is the opposite.
9) Nitrogen is a gas, at the same pressure and depending on the temperature, it could be in one of the three states of matter, from -196 ºC upwards, it remains as a gas, between-210ºC and -196ºC we have a liquid and less than -210 ºC the Nitrogen is solid.
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.