Answer: option 1. i and ii
Explanation:
Answer:
Chlorine is more electronegative than iodine. The electronegativity of chlorine is 3.16. The electronegativity of iodine is 2.66.
Please scan the whole entire question
<span>For that we need to know something about the chemistry aluminum sulfide and aluminum hydroxide. Aluminum sulfide will react with water to make insoluble aluminum hydroxide and hydrogen sulfide gas. Therefore, we need a balanced chemical equation.
Al2S3(s) + 6HOH --> 2Al(OH)3(s) + 3H2S(g)
17.7g ........................ ???g
17.7g Al2S3 x (1 mol Al2S3 / 150.3 g Al2S3) x (2 mol Al(OH)3 / 1 mol Al2S3) x (78.0g Al(OH)3 / 1 mol Al(OH)3) = 18.4 g Al(OH)3 ...... to three significant digits.</span>
Answer:
45) Ca < Co < Se
46) Te < S < O
Explanation:
These questions are talking about periodic trends. Here are some things to know about periodic trends:
Electronegativity
- how well an element attracts an electron
- increases left to right and bottom to top on the periodic table
- noble gases are not included
- fluorine is most electronegative element, Francium is least
Atomic Radius
- the distance between nuclei
- increases from right to left and top to bottom on the periodic table
- the more electronegative an element is, the smaller it's atomic radius
- Francium has the largest atomic radius while fluorine has the smallest
Ionization Energy
- the energy required to remove an electron
- directly proportional to electronegativity
Metallic Character
- how closely an element's properties match those of a metal
- directly proportional with atomic radius
Hope this helps :)
