Atomic Number 10


Learning Outcomes

Atomic Number 10 Element

Atomic number group 10 elements list. Which elements have group number of 10? List the atomic symbol and element names. The element that has the atomic number 17 is? List the symbols for two transition metals. Cu, Ag, and Au are all in what group # 11 7. Name two noble gases Any in Group 18 8. Give the symbol for two halogens. Any in group 17 9. What is the symbol for element with atomic number 74? What is the atomic mass of copper. Neon (Ne) has atomic number 10 with 10 protons in the nucleus (that's why, you know) and, where the Atomic Mass is round 20 (Standard atomic weight 20.1797), the most abundant isotope (90%) is 20Ne. Complete the chart. (Remember to enter a '0' if necessary) Atomic Number Element Symbol 1s 2s 2p 3s 3p 4s 3d 4p 5s 3 Lithium Li I don't understand the rest of what they want. Complete the chart. (Remember to enter a '0' if necessary) Atomic Number Element Symbol 1s 2s 2p 3s 3p 4s 3d 4p 5s 19 Potassium K. Complete the chart. (Remember to enter a '0' if necessary.) Atomic Number: 10 1s: 2s: 2p: 3s: 3p: 4s: 3d: 4p: 5s: - 4448370.

  • Define atomic and mass numbers.
  • Determine the number of protons, neutrons, and electrons in an atom.
  • Identify the charge and relative mass of subatomic particles.
  • Label the location of subatomic particles in the atom.
  • Determine the mass of an atom based on its subatomic particles.
  • Write A/Z and symbol-mass format for an atom.

Atoms are the fundamental building blocks of all matter and are composed of protons, neutrons, and electrons. Because atoms are electrically neutral, the number of positively charged protons must be equal to the number of negatively charged electrons. Since neutrons do not affect the charge, the number of neutrons is not dependent on the number of protons and will vary even among atoms of the same element.

Atomic Number

The atomic number (represented by the letter Z)of an element is the number of protons in the nucleus of each atom of that element. An atom can be classified as a particular element based solely on its atomic number. For example, any atom with an atomic number of 8 (its nucleus contains 8 protons) is an oxygen atom, and any atom with a different number of protons would be a different element. The periodic table (see figure below) displays all of the known elements and is arranged in order of increasing atomic number. In this table, an element's atomic number is indicated above the elemental symbol. Hydrogen, at the upper left of the table, has an atomic number of 1. Every hydrogen atom has one proton in its nucleus. Next on the table is helium, whose atoms have two protons in the nucleus. Lithium atoms have three protons, beryllium atoms have four, and so on.

Since atoms are neutral, the number of electrons in an atom is equal to the number of protons. Hydrogen atoms all have one electron occupying the space outside of the nucleus. Helium, with two protons, will have two electrons. In the chemical classroom, the proton count will always be equivalent to an atom's atomic number. This value will not change unless the nucleus decays or is bombarded (nuclear physics).

Mass Number

Where is the atomic number located

Experimental data showed that the vast majority of the mass of an atom is concentrated in its nucleus, which is composed of protons and neutrons. The mass number (represented by the letter A)is defined as the total number of protons and neutrons in an atom. Consider the table below, which shows data from the first six elements of the periodic table.

Table (PageIndex{1}): Atoms of the First Six Elements
NameSymbolAtomic Number (Z)ProtonsNeutronsElectronsMass Number (A) (rounded to two decimals)

Consider the element helium. Its atomic number is 2, so it has two protons in its nucleus. Its nucleus also contains two neutrons. Since (2 + 2 = 4), we know that the mass number of the helium atom is 4. Finally, the helium atom also contains two electrons, since the number of electrons must equal the number of protons. This example may lead you to believe that atoms have the same number of protons and neutrons, but a further examination of the table above will show that this is not the case. Lithium, for example, has three protons and four neutrons, giving it a mass number of 7.

Knowing the mass number and the atomic number of an atom allows you to determine the number of neutrons present in that atom by subtraction.

[text{Number of neutrons} = text{ rounded mass number} - text{atomic number}]

Atoms of the element chromium (left( ce{Cr} right)) have an atomic number of 24 and a mass number of 52. How many neutrons are in the nucleus of a chromium atom? To determine this, you would subtract as shown:

[52 - 24 = 28 : text{neutrons in a chromium atom}]

The composition of any atom can be illustrated with a shorthand notation called A/Z format. Both the atomic number and mass are written to the left of the chemical symbol. The 'A' value is written as a superscript while the 'Z' value is written as a subscript. For an example of this notation, look to the chromium atom shown below:


Another way to refer to a specific atom is to write the mass number of the atom after the name, separated by a hyphen. Symbol-mass format for the above atom would be written as Cr-52. In this notation, the atomic number is not included. You will need to refer to a periodic table for proton values.

Example (PageIndex{1})

Calculate each of the three subatomic particles and give specific group or period names for each atom.

  1. mercury
  2. platinum
  3. bromine


  1. Hg (transition metal)- has 80 electrons, 80 protons, and 121 neutrons
  2. Pt (transition metal)- has 78 electrons, 78 protons, and 117 neutrons
  3. Br (halogen)- has 35 electrons, 35 protons, and 45 neutrons

Example (PageIndex{2})

Write both A/Z and symbol-mass formats for the atoms in Example (PageIndex{1}).


  1. (ce{^{201}_{80}Hg}) and Hg-201
  2. (ce{^{195}_{78}Pt}) and Pt-195
  3. (ce{^{80}_{35}Br}) and Br-80

Example (PageIndex{3})

Identify the elements based on the statements below.

  1. Which element has 25 protons?
  2. Which element has 0 neutrons?
  3. Which element has 83 electrons?


a. manganese

b. hydrogen

c. bismuth

Need More Practice?

  • Turn to section 3.E of this OER and answer questions #1-#2, #4, and #8.

Contributors and Attributions

  • CK-12 Foundation by Sharon Bewick, Richard Parsons, Therese Forsythe, Shonna Robinson, and Jean Dupon.

  • Allison Soult, Ph.D. (Department of Chemistry, University of Kentucky)

If an atom has an atomic number of 10, how many electrons does it have?

1 Answer

#10# Unless of course, the atom has a charge in it.


You just have to remember these basic rules:

(1) The atomic number is equal to the number of protons in that atom.


Atomic Number 106

(2) If the atom is neutrally charged (or zero charged), the number of electrons is the same as the number of protons.

Otherwise, negative charge means that the atom gained electrons, and for positive charge the atom lost electrons.

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For example,

#Na# (atomic number = 11) : #1s^2##2s^2##2p^6##color (red) (3s^1)# (ground state)

#Na^'+1'#(atomic number = 11) : #1s^2##2s^2##color (blue) (2p^6)# (lost 1 #e^-#)

#Cl# (atomic number = 17) : #1s^2##2s^2##2p^6##3s^2##color (red) (3p^5)# (ground state)

Atomic Number Chart

#Cl^'-1'# (atomic number = 17) : #1s^2##2s^2##2p^6##3s^2##color (red) (3p^6)# (gain 1 #e^-#)

List Of Periodic Table Elements

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