That gives a total of 5 electrons, so neutral phosphorus atoms have 5 valence electrons. The 10 remaining electrons, from the first and second shells, are core electrons.

You are watching: Give the number of core electrons for se.

Furthermore, how many core electrons does be have?

Look at the electron configuration for beryllium (Be). There are two core electrons (1s2) and two valence electrons (2s2). When we look at the electron configuration for Selenium (Se), we see the following. There are 28 core electrons (1s22s22p63s23p63d10) and six valence electrons (4s24p4).

Likewise, why is 3rd shell 8 or 18? Each shell can contain only a fixed number of electrons: The first shell can hold up to two electrons, the second shell can hold up to eight (2 + 6) electrons, the third shell can hold up to 18 (2 + 6 + 10) and so on. The general formula is that the nth shell can in principle hold up to 2(n2) electrons.

Cadmium atoms have 48 electrons and the shell structure is 2.8. 18.18.

What is the number of valence electrons in phosphorus?

five valence electrons

### How many core electrons does oxygen have?

Nitrogen has 7 electrons --- 2 in the first shell, and 5 in the second shell (so five valence electrons). Oxygen has 8 electrons --- 2 in the first shell, and 6 in the second shell (so six valence electrons).

### How do you fill valence electrons?

The ones digit in the group number is the number of valence electrons. To solve without a periodic table, find the electron configuration of the element and count the electrons into 1 group of 2, and then into shells of 8. The number in the last group is the amount of valence electrons.

Antimony

### Is cadmium a metal or nonmetal?

Cadmium is a soft, malleable, ductile, silvery-white divalent metal. It is similar in many respects to zinc but forms complex compounds. Unlike most other metals, cadmium is resistant to corrosion and is used as a protective plate on other metals.

### What is the Valency of cadmium?

Answer and Explanation: Cadmium has two valence electrons. This means that it has two electrons located in its outer shell.

### What is the number of valence electrons in tungsten?

Tungsten atoms have 74 electrons and the shell structure is 2.8.

### How many 4d electrons are in CD?

Atomic Number Symbol Valence Electrons
45 Rh 4d85s1
46 Pd 4d10
47 Ag 4d105s1
48 Cd 5s2

### Which element has the smallest atomic radius?

As can be seen in the figures below, the atomic radius increases from top to bottom in a group, and decreases from left to right across a period. Thus, helium is the smallest element, and francium is the largest.

### What is the electron configuration of cd2+?

Electron configuration of Cd can be given as 5s24d10 - that is very convenient short hand notation, that uses noble gas configuration as its basis. Configuration of Kr is 1s22s22p63s23p64s23d104p6, so 5s24d10 means 1s22s22p63s23p64s23d104p65s24d10 - that"s configuration of neutral Cd atom.

### Is CD 2 paramagnetic or diamagnetic?

Since these are not valence, they are not as relevant to describe the reactivity of Cd . All electrons are paired, making the neutral molecule Cd2 diamagnetic. Hence, Cd+2 , with one less electron from a fully-occupied orbital, is paramagnetic.

### What gas has 48 neutrons?

Name Krypton
Atomic Mass 83.8 atomic mass units
Number of Protons 36
Number of Neutrons 48
Number of Electrons 36

### Why does M Shell have 8 electrons?

However if you consider the first 18 elements of the periodic table, the maximum number of electrons found in the m-shell is 8. This is because of the fact that electrons are filled in shells in the increasing order of energy. So, first the shells are filled in the order k, then l, and finally m.

### How is Valency calculated?

The valency of an atom is equal to the number of electrons in the outer shell if that number is four or less. Otherwise, the valency is equal to eight minus the number of electrons in the outer shell. Once you know the number of electrons, you can easily calculate the valency.

### Why does the 3rd period have 8 elements?

According to the Aufbau"s Principle (the building up principle) there can be only EIGHT elements that satisfy this. This is because the S orbital of the fourth shell sits at a lower energy level (closer to the nucleus) than the d orbital of the third shell.

See more: French Words That Start With A Bulary & Dictionary Words, French Words Starting With A, B And C

### What is the capacity of M shell?

Energy Level (Principal Quantum Number) Shell Letter Electron Capacity
1 K 2
2 L 8
3 M 18
4 N 32

six electrons

### How many electrons can 5f hold?

Each orbital can hold two electrons, so the capacity of an nf subshell is 14 electrons.