why only elements 1-20 (hydrogen to calcium) are shown through Bohr-Rutherford models. Any element bigger than calcium (those in the transition element part of the periodic table) don't work as well

As previously discussed, there is a connection between the number of protons in an element, the atomic number that distinguishes one element from another, and the number of electrons it has. In all electrically-neutral atoms, the number of electrons is the same as the number of protons. Each element, when electrically neutral, has a number of electrons equal to its atomic number.

Explanation:

organisms are more likely to be more preserved in mud than sand because mud is moist and wet, while sand is very dry.

a pan containing water is placed in a positio n where it is exposed to a 10 mile per hour wind. the pan contains a uniform depth of 1.27 cm of water, is quite wide, and has a length of 2.44 m in the wind direction. the water in the pan is at a constant temperature of 15.5 °c.