B. metalloid
C. nonmetal
D. noble gas
The element in period 4 and group 1 of periodic table is potassium which is a metal.
An element is said to possess metallic properties if it has 1,2,3 electrons in its valence shell as these number of electrons can be easily removed by supplying less amount of energy .
Elements present in group 1,2,3 have 1,2,3 valence electrons respectively.Hence, these elements are metals and it is a characteristic property of metals to easily loose electrons.
Hence group 1, 2 are metals which comprises the s-block of the periodic table.Metallic properties increases down the group as distance between valence electrons and nucleus increases due to which they can be easily removed.
Metallic propertiesdecrease along a period as electrons are added to same shell and hence cannot be easily removed.
Learn more about metallic properties,here:
#SPJ6
Answer:
B.
Explanation:
The electron dot diagram which is also known as the Lewis electron dot diagram is a diagram that shows an atom's valence electrons by placing dots, which represent the valence electrons of the element, around the elements symbol
The element for which the electron dot diagram is found = Neon, Ne
The atomic number of neon, Ne = 10
The electronic configuration of neon = 1s²2s²2p⁶
The valence shell is the outermost shell having the highest value of the coefficient of the orbitals, n = 2s²2p⁶
The number valence electrons in neon = The number of electrons in the valency shell = 2 electrons + 6 electrons = 8 electrons
The number of valence electrons in neon = 8
Therefore, the electron dot diagram for neon will have 8 dots located around the Ne symbol, which gives option B
Answer:
B. Lithium (Li)
Explanation:
Lithium forms an ionic compound with nitrogen with the general formula X₃N. When lithium and nitrogen react, they form a nitride called lithium nitride.
The Lithium nitride is actually prepared by the direct combination of elemental lithium with nitrogen gas. Below is the reaction equation:
6Li + N₂ → 2Li₃N
The reaction can occur when a solution of lithium in liquid sodium metal is treated with N₂. When the Lithium nitride reacts with water, it does that violently and produces ammonia.
Answer:
Selling price of watch A and watch B= Rs. 425
Let cost price of watch A=x
Profit =10%
∴
100
110
x=425
x=386.36
Let cost price of watch B=y
Loss =10%
∴
100
90
y=425
y=472.22
Net cost price =x+y=858.5858
Net selling price =850
Loss%=
858.58
858.5858−850
×100=1%
Explanation:
please mark me as the brainliest answer and please please pleaseeee follow me for more answers to your questions
Answer:
Atomic Number of Chlorine. Chlorine is a chemical element with atomic number 17 which means there are 17 protons and 17 electrons in the atomic structure.
Explanation: