Answer:
Atomic Mass of Element = 59.57 amu
Given Data:
Element X Isotope 1 atomic weight = 59.015 amu
Element X Isotope 2 atomic weight = 62.011 amu
The abundance of lighter isotope = 81.7%
Atomic Mass of Element X = ?
Solution:
81.7% is the abundance of element that is lighter so it is the of the isotope having weight 59.015 amu
Then the remaining abundance = 100 -81.7 = 18.3 %
18.3 % abundance of the isotope weight = 62.011 amu
Formula:
Mass of the element = % of abundance (atomic mass of Isotope 1) + % of abundance (atomic mass of Isotope 2)
Put the values
Atomic mass of Element X = 81.7/100 (59.015) + 18.3 /100 (62.011)
Atomic mass of Element = 0.817 (59.015) + 0.183 (62.011)
Atomic mass of Element = 48.22 + 11.35
Atomic Mass of Element = 59.57 amu
Answer:
Column 17 halogens
Explanation:
To answer the question we need to know the following;
What are valence electrons?
- Valence electrons are outermost electrons in the outermost energy level of an atom of any element.
What are halogens?
- Halogens are group 7 elements that have seven valence electrons. They include, chlorine, fluorine, iodine, etc
What is the reactivity of halogens?
- Halogens are the most reactive non-metals in the periodic table. They react by gaining one electron to attain a stable configuration.
There are a total of 118 elements on the periodic table.
Answer:
I would say the second one it's the wrong
Answer:
mass
Explanation:
How much does air weigh? It might not seem like it, but air has weight. Anything with mass has weight, and we know air has mass because (for example) we can feel it when the wind blows. The total weight of the atmosphere exerts a pressure of about 14.7 pounds per square inch at sea level.
-weatherstreet.com