Name: Electrovalency
Uploaded: 2019-07-19
Duration: 1 min 51 s
Description: Do you know how chemical bonds are formed? They are formed in order to attain a stable electronic configuration. Let's watch the video to learn about the pro...

Question

Complete the following table:

Mass number	Atomic number	Number of protons	Number of neutrons	Name of the element
$31$	$15$	$-$	$-$	$-$
$-$	$-$	$12$	$12$	$-$
$-$	$17$	$-$	$18$	$-$

Accepted Answer

Given,

Mass number $= 31$ and Atomic number $= 15$ .

We know that,

Number of protons $=$ Atomic number $= 15$ . Hence, number of protons is $15$ .

Number of neutrons $=$ Mass number $-$ Number of protons.

Hence, number of neutrons $= 31 - 15 = 16$ .

Thus, the name of the element is phosphorous.

Given,

Number of protons $= 12$ and Number f neutrons $17$ .

We know that,

Atomic number $=$ Number of protons $= 12$ . Hence, atomic number is $12$ .

Mass number $=$ Number of protons $+$ Number of neutrons.

Mass number $= 12 + 12 = 24$ . Thus, the name of the element is magnesium.

Given,

Atomic number $= 17$ and number of neutrons $= 18$ .

We know that,

Number of protons $=$ Atomic number $= 17$ . Hence, number of protons is $17$ .

Mass number $=$ Number of protons $+$ Number of neutrons.

Mass number $= 17 + 18 = 35$ .

Thus, the element is chlorine.

Mass number Atomic number Number of protons Number of neutron Name of the element

$31$ $15$ $15$ $31 - 15 = 16$ Phosphorous $(P)$

$24$ $12$ $12$ $12$ Magnesium $(Mg)$

$35$ $17$ $17$ $18$ Chlorine $(Cl)$

Complete the following table:

Mass number Atomic number Number of protons Number of neutrons Name of the element

$31$ $15$ $-$ $-$ $-$

$-$ $-$ $12$ $12$ $-$

$-$ $17$ $-$ $18$ $-$

Important Questions on Structure of Atom

Learn and Prepare for any exam you want !

Complete the following table: Mass number Atomic number Number of protons Number of neutrons Name of the element 31 15 - - - - - 12 12 - - 17 - 18 -

Important Questions on Structure of Atom

Learn and Prepare for any exam you want !

Complete the following table:

Mass number Atomic number Number of protons Number of neutrons Name of the element

$31$ $15$ $-$ $-$ $-$

$-$ $-$ $12$ $12$ $-$

$-$ $17$ $-$ $18$ $-$