Both carbon and lead belong to Group IV elements, and thus they have the same number of valence electrons.
<span>In
each of the other options, the two elements belong to different groups,
and thus they do NOT have the same number of valence electrons.
I hope this helped you, please tell me if I am correct or not <3
</span>
Answer:
x = 35.453 amu. CHLORINE
Explanation:
Abundance of X³⁵ = 75.77%
Abundance of X³⁷ = 24.23%
Atomic mass of X³⁵ = 34.968852 amu
Atomic mass of X³⁷ = 36.965903 amu
Average atomic mass = ?
Solution:
Average atomic mass of carbon = (abundance of 1st isotope × its atomic mass) +(abundance of 2nd isotope × its atomic mass) / 100
Average atomic mass of carbon = (34.968852 × 75.77)+(36.965903 ×24.23) /100
Average atomic mass of carbon= 2649.59 + 895.684 / 100
Average atomic mass of carbon = 3545.274 / 100
Average atomic mass of carbon = 35.453 amu.
x = 35.453 amu. CHLORINE
Answer:
The correct options are;
1. 1,600
2. 100 Watts
A 23-30 watt CFL provides <u>1,600</u> lumens and is equivalent to a <u>100 Watts</u> incandescent bulb
Explanation:
Brightness is measured in lumens and watts measure energy usage therefore with the use of an energy saving light bulb, the same lumination can be obtained at a lower energy usage.
According to a comparison chart for LED Lights vs. Incandescent Light Bulbs vs. Compact Fluorescents (CFLs) from USAI lightening website 23-30 watts CFL has a light output of 1,600 and is therefore produces enough light as a 100 Watts Incandescent Light Bulb
Also according to energy.gov website, CFLs save up to 75% energy such that a 23-30 watt CFL can produce the same illumination as a 100 watt incandescent bulb
Therefore we have, a 23-30 watt CFL provides <u>1,600</u> lumens and is equivalent to a <u>100 Watts</u> incandescent bulb.
Answer:
The correct answer is option 3 = group 13
Explanation:
Hello! Let's solve this!
In the periodic table the groups are vertical and the horizontal periods. The elements of group 13 such as Aluminum (Al), Boron and others. These elements have 3 valence electrons. Element X needs to have 3 valence electrons since Br accepts an electron and there are 3 bromine.
The correct answer is option 3 = group 13
