What element is 4s2? Answer and Explanation: A main group element with the valence electron configuration 4s2 4 s 2 is in
periodic group 2
as the general valence electron configuration of…
What element is 3s2?
| A B | Phosphorous 1s2 2s2 2p6 3s2 3p3 | Hydrogen 1s1 | Helium 1s2 | Lithium 1s2 2s1 |
|---|
What is the group number of an atom if it has an outermost shell of 4s2 4p5?
1 Answer. Ernest Z. The atom would be in Period 4 and
Group 17
.
What does ca2+ mean in chemistry?
Calcium ion
| Ca+2 – PubChem.
How is ca2+ formed?
Plasma calcium levels in mammals are tightly regulated, with bone acting as the major mineral storage site. Calcium ions, Ca
2 +
, are
released from bone into the bloodstream under controlled conditions
. Calcium is transported through the bloodstream as dissolved ions or bound to proteins such as serum albumin.
Calcium is
a mineral most often associated with healthy bones and teeth
, although it also plays an important role in blood clotting, helping muscles to contract, and regulating normal heart rhythms and nerve functions.
7 Hence the actual electronic configuration of
copper
is Cu Z=29 [Ar] 4s1 3d10.
The electron configuration 1s22s22p63s23p2 is the element
Silicon
.
According to the periodic table, this element is
sulfur
.
| 1.Hydrogen: 1s1 2 – Helium: 1s2 | 45 – Rhodium: [Kr], 5s2, 4d7 46 – Palladium : [Kr], 5s2, 4d8 | 47 – Silver: [Kr], 5s2, 4d9 48 – Cadmium: [Kr], 5s2, 4d10 | 49 – Indium: [Kr], 5s2, 4d10, 5p1 50 – Tin: [Kr], 5s2, 4d10, 5p2 |
|---|
- If the element is in s block, then the group number is equal to the number of valence electrons. …
- If the element is in the p block, then the number of the group can be determined by the formula: (number of valence electrons + 10).for groups.
For neutral atoms,
the number of valence electrons is equal to the atom’s main group number
. The main group number for an element can be found from its column on the periodic table. For example, carbon is in group 4 and has 4 valence electrons. Oxygen is in group 6 and has 6 valence electrons.
calcium (Ca),
chemical element
, one of the alkaline-earth metals of Group 2 (IIa) of the periodic table.
Ca
2 +
represents an ion with 20 protons and
18 electrons
. A calcium atom has 20 protons and 20 electrons. The 2+ charge next to the symbol indicates a loss of two electrons: 20-2=18.
Calcium was named after the Latin term calx meaning lime, and is
a reactive silvery metallic element found in Group 2 of the periodic table
.
Magnesium ion
| Mg+2 – PubChem.
Where did calcium get its name? Sir Humphry Davy named calcium
after the Latin word “calx” which is what the Romans called lime
. Calcium has four stable isotopes including
40
Ca,
42
Ca,
43
Ca, and
44
Ca.
1 Answers. Electronic configuration of Cr is [Ar]3d5 4s1, instead of the expected [Ar]3d4 4s2. This is so because
half filled d orbitals have extra stability
. So in case of Cr, one electron from the 4s orbital goes to the 3d orbital to make it half filled, and Cr attains extra stable state.
Figure 1: Electronic energies orbitals. The oddity is the position of the 3d orbitals, which are shown at a slightly higher level than the 4s. This means that
the 4s orbital which will fill first
, followed by all the 3d orbitals and then the 4p orbitals.
