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Why first period contains 2 elements while second period contains 8 elements?
Wiki User
∙ 11y ago
Each row in the table contains elements that have the same number of electron orbit shells. The first orbit, which is closest to the nucleus only has space for 2 electrons (no idea why, sorry). This is why only hydrogen (1 electron) and helium (2 electrons) are in the first row.
The second row has the same inner shell, with 2 electrons and an outer shell with room for 8...and so on.
Wiki User
∙ 11y ago
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The first period in the periodic table represents elements that possess only the first energy level s orbital therefore this period contains?
Two elements
The first period in the periodic table represents elements that possess only the first energy level s orbital therefore this period contains elements?
hydrogen and helium
Period in chemistry?
A period is a horizontal row on the periodic table of the elements. There are seven periods on the periodic table. Each period corresponds to the highest energy level that contains electrons. For example, the elements in the first period have electrons in the first energy level, which is the only energy level available; the elements in the second period have their highest energy electrons in the second energy level; the elements in the third period have their highest energy electrons in the third energy level, and so on.
How does the Bohr model of the atom relate to the Periodic Table?
The Bohr model of the atom places electrons in orbits or "shells." Elements in the first period only have electrons in the first shell. Elements in the second period have electrons in the first two shells. Elements in the third period have electrons in the first three shells, and so on.
How many elements in the first period?
Period 1: 2 elements Period 2: 8 elements Period 3: 8 elements Period 4: 18 elements Period 5: 18 elements Period 6: 32 elements Period 7: 25 elements
The first period in the periodic table represents elements that possess only the first energy level s orbital therefore this period contains?
Two elements
The first period in the periodic table represents elements that possess only the first energy level s orbital therefore this period contains elements?
hydrogen and helium
The first period in the peroidical table represents elements that possese elements only the first energy level is orbital thefore this perid contains?
two elements, hydrogen and helium.
The first period on the periodic table represents elements that possess only the first energy level s orbital therefore this period contains?
two
Period in chemistry?
A period is a horizontal row on the periodic table of the elements. There are seven periods on the periodic table. Each period corresponds to the highest energy level that contains electrons. For example, the elements in the first period have electrons in the first energy level, which is the only energy level available; the elements in the second period have their highest energy electrons in the second energy level; the elements in the third period have their highest energy electrons in the third energy level, and so on.
How does the Bohr model of the atom relate to the Periodic Table?
The Bohr model of the atom places electrons in orbits or "shells." Elements in the first period only have electrons in the first shell. Elements in the second period have electrons in the first two shells. Elements in the third period have electrons in the first three shells, and so on.
How many elements in the first period?
Period 1: 2 elements Period 2: 8 elements Period 3: 8 elements Period 4: 18 elements Period 5: 18 elements Period 6: 32 elements Period 7: 25 elements
Which period table group are made up of only gases?
The first period or row contains only elements that are gases at standard temperature and pressure.
What level is filled by krypton?
The fourth electron shell is filled by krypton. Krypton is the last element in the fourth period on the periodic table. Each of the periods represents an electron shell. Elements in the first period have electrons in the first shell; elements in the second period have electrons in the second shell; and so on.
Does the periodic table explain the shell model or does the shell model explain the periodic table?
The shell model explains the organization of the periodic table. The elements in the first period have electrons in the first shell; the elements in the second period have electrons in the first two shells; the elements in the third period have electrons in the first three shells; and so on.
What elements belong to the first period?
There are two elements in the first period, hydrogen and helium.
Since the first energy level contains only the 1s sublevel the number of elements in this period is?
2
