Correct answer: <span>The first ionization energy decreases and the electronegativity decreases.
Reason:
As we move from top to bottom in a periodic table, atomic radius increases. Also, effective nuclear charge decreases. Due to this, energy required to remove the electron form valance shell decreases. Hence, ionization energy decreases from top to bottom.
In addition to this, metallic character increases from top to bottom. Metals have low </span><span>electronegativity as compared to non-metals. Hence, electronegativilty value decreases from top to bottom. </span>
PH = -log [H⁺] ←←[log without a specified base means log base 10]
<span>and if you want to use the hydronium ion concentration then use pH = -log [H₃O⁺] </span>
<span>either way the calculation is the same: </span>
<span>They give that a 0.1 M solution of NaHCO₃ has a hydrogen ion concentration of 4.0 x 10^(-9) </span>
<span>so pH = -log (4.0 x 10^(-9)) </span>
<span>pH = 8.4</span>
Answer:
C!
Explanation:
only C
A: solid B: liquid : C: GAS
Antarctic soils exist, in general, they comprise a surface pavement (i.e., a layer of gravel, stones or boulders formed largely by weathering and the removal of fine materials mainly by wind action) and a seasonally thawed active layer over permafrost.
Number of electron determine reactivity
