If uranium-241 lost 2 protons and 2 neutrons, then thorium-237 would be produced. The number beside the element is the mass number which is the sum of protons and neutrons. If uranium would lose 2 protons and 2 neutrons, then the mass number would decrease by 4 making it 237. Looking in a periodic table, thorium is the element which has a mass number of 237.
Answer:
4.5g/mL
Explanation:
Given parameters:
Mass of ball = 36g
Volume of the ball = 8mL
Unknown:
Density of the ball = ?
Solution:
Density is the mass per unit volume of a substance.
Density = 
So;
Density = 
= 4.5g/mL
No, dimethyl amine and triethyl amine are not more soluble in water. Both are soluble in water but not more soluble in water. These are also soluble in alcohol.
Dimethyl amine is a secondary amine while triethyl amine is a tertiary amine. Generally, the small amines are more soluble in water. As the hydrocarbon chain goes on increasing, the solubility goes on decreasing.
Answer:
a) Ionic bonding
Covalent bonding
Metallic bonding
b) Electrons with the same state must have opposite spins.
Electron state can hold no more than two electrons.
Explanation:
a) When an atom loses electrons it became a cation, with a positive charge, and when an atom gain electrons it became an anion, with a negative charge. Because of the attraction of the opposite charges, the ions form a bond, which is called ionic bonding.
When atoms share electrons to complete the octet rule, they form a molecule by covalent bonding.
When a metal loses its valence electrons, they form a "sea of electrons" and the cations are "glued" by them, which is called metallic bonding.
b) The Pauli exclusion principle determinants that two electrons can not occupy the same state at the same time, it means that two electrons can't have the same four quantic number equal. If they are at the same shell, they must have different spins. The electron can have only two spin (-1/2 or +1/2) so the electron state can hold no more than two electrons, and they have to have opposite spins.
