Lead has a molar mass of 207.2g mol -1. Assuming that it is composed entirely of 206Pb, 207Pb and 208Pb, and that the percentage of the two lightest isotopes are equal. Calculate the relative percentage of these isotopes in the natural element

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What’s the scientific notation for the number 6,840,000,000

Select the correct answer from each drop-down menu. describe what happens to a carbon-11 atom when it undergoes positron emission. the decay of a carbon-11 atom _1_, and this causes it to emit _2_.options for 1: > changes a neutron into a proton> changes a proton into a neutron> is hit with a neutron> reconfigures its protons and neutronsoptions for 2: > a negatively charged electron-sized particle> a positively charged election-sized particle> two atoms and several neutrons> two neutrons and two protons

Asolid that forms and separates from a liquid mixture is called