Atomic weight is actually calculated by the sum of protons and neutrons of that atom. It is not equal to the number. You must add them for the result
Electronegativity of an element decreases as we move down a group on the periodic table and electronegativity increases while moving from left to right across a period on the periodic table.
Explanation:
- The electronegativity increases as we move from left to right across a period because from left to right across a period, the nuclear charge is increasing Hence the attraction for the valence electrons also increases.
- As we move down a group, the atoms of each element have an increasing number of energy levels. The distance between the nucleus and valence electron shell increases and reduces the attraction for valence electrons. Hence electronegativity decreases as we move from top to bottom down a group.
U should try Chegg to be honest dats how I got through chemistry
Answer:
Q1. 0.82 mol
Q2. 9.20 g
Explanation:
Question 1
Step 1: Given and required data
- Mass of NaHCO₃ (m): 68.88 g
- Molar mass of NaHCO₃ (M): 84.01 g/mol
Step 2: Calculate the moles (n) corresponding to 68.88 g of NaHCO₃
We will use the following expression.
n = m/M
n = 68.88 g/(84.01 g/mol) = 0.82 mol
Question 2
Step 1: Given data
- Moles of NaOH (n): 0.23 mol
- Molar mass of NaOH (M): 40.00 g/mol
Step 2: Calculate the mass (m) corresponding to 0.23 moles of NaOH
We will use the following expression.
m = n × M
m = 0.23 mol × 40.00 g/mol = 9.20 g
Answer:
E.
Explanation:
E - The lone pair in the nitrogen atom squeezes the perfect tetrahedron by a couple of degrees.
