No. The speed of light does change. You mean speed of light in a vacuum. Measuring that value is elementary, in a 2-way measurement, as you show.
Covalent bonds do not involve electron transfer because in covalent bonds, the electrons are shared between the atoms to form the molecule rather than being transferred to form ions as it is in the case of ionic bonds.<span />
<h2>O sistema nervoso do corpo é formado pelo cérebro, pela medula espinhal, pela retina e por muitos outros nervos.</h2><h2> O sistema circulatório é constituído pelo coração, artérias, veias e capilares. </h2>
<span>A chemical reactions :
Involves small amounts of energy.
</span><span> Only electrons are involved.
</span><span>The mass remains the same.</span>
Protons: 7
electrons: 7
neutrons: 7