According to octet rule element has eight electrons in its valence shell.This give it the same electronic configuration as a group 18 elements.Atom with electronic configuration 1s2 2s2 2p1 require five electrons to achieve octet. This is because the valence electrons are 3 in 2s2 and 2p1 and hence require 5 electrons to be filled.
Answer:
Name
Atomic Number
Atomic Symbol
Atomic Weight
Phase
Color
Classification
Group in Periodic Table
Group Name
Period in Periodic Table
Block in Periodic Table
Electronic Configuration
Melting Point
Boiling Point
Electronic Shell Structure
CAS Number
Neighborhood Elements
Lithium
3
Li
6.941
Solid
Silver
alkali metal
1
lithium family
2
s
[He] 2s1
180.54 °C
1342 °C
2, 1
CAS7439-93-2
Neighborhood Elements of Lithium
Cesium
55
Cs
132.90545
Solid
Silver
alkali metal
1
lithium family
6
s
[Xe] 6s1
28.44 °C
671 °C
2, 8, 18, 18, 8, 1
CAS7440-46-2
Neighborhood Elements of Cesium
Explanation:
Answer:
hope this will help you......
Answer:
B). An Experiment that tests the hypothesis.
Explanation:
The element that is missing from Yasir's scientific investigation is 'an experiment which tests a hypothesis.' His experiment does not provide a verifiable statement revealing his proposition or prediction regarding the possible outcome of the experiment which could be verified by using a research or investigation. He rather tests his proposition indirectly by asking 'which color they like better' and using it to make an educated guess. Thus, <u>option B</u> is the correct answer.
I think the answer is
A) an acid
