According to the Aufbau principle, the 4s sublevel<span> is filled </span>before the 3d sublevel <span>because the </span>4s<span> is lower in energy. ... This is why when </span>electrons<span> are lost from the </span>orbitals<span> of the transition metals, they are lost from the </span>4s<span> first because it is higher in energy</span>
Answer: Each isotope has an equal number of protons and electrons.
A molecule that can h-bond will not always necessarily and does not have guarantee to have a higher boiling point than one than cannot have h-bond.
we can take an example of Pentan-2-one that cannot h-bond but instead of this it has a high boiling point that is 102.3 °C, while propan-1-ol can h-bond but it has a boiling point of 97.2°C, that is lower than the boiling point of Pentan-2-one.
Mechanical because your using your hand movement to pluck the strings
To prevent more than one sperm from entering the egg.
What is oocyte?
An oocyte , or ovocyte is a female gametocyte or germ cell involved in reproduction. In other words, it is an immature ovum, or egg cell. An oocyte is produced in a female fetus in the ovary during female gametogenesis. The female germ cells produce a primordial germ cell (PGC), which then undergoes mitosis, forming oogonia. During oogenesis, the oogonia become primary oocytes. An oocyte is a form of genetic material that can be collected for cryoconservation.
When the sperm and egg fuse it triggers a release of calcium ions, which cause the cortical granules inside the egg to fuse with the plasma membrane. As they fuse, these granules release their contents outside of the cell, toward the remains of the zona pellucida.
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