The kinetic theory states that matter consists of particles in constant motion.
The sum of the mass numbers and the sum of the atomic numbers balance on either side of an equation
All of them could mean that a reaction has occurred
Answer:
The disease is named after a British physician, James Parkinson, who first described it in “An Essay on the Shaking Palsy” in 1817. In Parkinson's disease, nerve cells, also called neurons, in a region of the brain called the substantia nigra begin to malfunction or die, a process called neurodegeneration.
Answer:
NaF
Explanation:
Electronic configuration of Sodium is as follow,
Na = 11 = 1s², 2s², 2p⁶, 3s¹
As shown in electronic configuration, Sodium has 1 valence electrons in its valence shell. Therefore, to complete its noble gas configuration it donates one electron form Na⁺.
Na⁺ = 1s², 2s², 2p⁶
Electronic configuration of Fluorine is as follow,
F = 9 = 1s², 2s², 2p⁵
As shown in electronic configuration, fluorine has 7 valence electrons in its valence shell. Therefore, to complete its noble gas configuration it accepts one electron from Na to form F⁻.
F⁻ = 1s², 2s², 2p⁶
Henec, in order to form a neutral molecules, one Na⁺ combines with one F⁻ to form NaF.
