Bromine atoms usually end up with SEVEN valence electrons.
Bromine belongs to group 17 i.e. halogen group. Its atomic number is 35. The electron configuration of Bromine is 1s² 2s²2p⁶ 3s²3p⁶ 4s²3d¹⁰4p⁵. In the last shell, we see 4s²4p⁵, thus 2+5 = 7 valence electrons are present.
Answer:
1. A. Sour.
B. Irritating
2. A. Slippery
B. Bitter
C. Irritating
Explanation:
Acids induce salivation in the mouth which increases the bicarbonate secretions thus the sour taste. Sour taste receptors detect the hydrogen ion in the acids.
Acids may react with the fluids in the eye and thus irritate the eye cells. This is because they alter the pH of the eye fluids. Once they get into the eye they should be rinsed thoroughly with enough water and professional medical assistance sought.
Bases have a soapy feel in the skin. This is because they dissolve the fatty acids in the skin and form complexes. These complexes have a slippery feel.
The bases taste bitter in the mouth. The OH ions bind to the bitter taste receptors thus causing the bitter taste.
Once these bases get into the eyes, they alter pH of eye fluids thus causing irritation.
Answer:
We have day and night because the Earth rotates. It spins on its axis, which is an imaginary line passing through the North and South Poles. The Earth spins slowly all the time, but we don't feel any movement because it turns smoothly and at the same speed.
<u>Answer:</u> The number of atoms of bromine present in given number of mass is ![1.03\times 10^{22}](https://tex.z-dn.net/?f=1.03%5Ctimes%2010%5E%7B22%7D)
<u>Explanation:</u>
To calculate the number of moles, we use the equation:
![\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}](https://tex.z-dn.net/?f=%5Ctext%7BNumber%20of%20moles%7D%3D%5Cfrac%7B%5Ctext%7BGiven%20mass%7D%7D%7B%5Ctext%7BMolar%20mass%7D%7D)
Given mass of bromine = 1.37 g
Molar mass of bromine = 79.904 g/mol
Putting values in above equation, we get:
![\text{Moles of bromine}=\frac{1.37g}{79.904g/mol}=0.0171mol](https://tex.z-dn.net/?f=%5Ctext%7BMoles%20of%20bromine%7D%3D%5Cfrac%7B1.37g%7D%7B79.904g%2Fmol%7D%3D0.0171mol)
According to mole concept:
1 mole of an element contains
number of atoms.
So, 0.0171 moles of bromine will contain =
number of bromine atoms.
Hence, the number of atoms of bromine present in given number of mass is ![1.03\times 10^{22}](https://tex.z-dn.net/?f=1.03%5Ctimes%2010%5E%7B22%7D)