Question

please solve this as fast as possible...​

Answer 1

Answer:

P=carbon

Q=neon

R=sodium

S=chlorine

Explanation:

mass no.= no. of neutrons + no. of protons

atomic no.= no. of electrons

and....no. of protons = no. of electrons

thus to find and element

subtract no. of neutrons from mass no. u will get the no. electrons which = to atomic no. thus find out the element from periodic table by atomic no.

@disha

Answer 2

Answer:

Formula is

mass no. = no. of protons + no. of neutrons

[ put the value ]

1.) For P

12 = no. of protons + 6

12 - 6 = no. of protons

6 = no. of protons

atomic number = no. of protons

Atomic number = 6

2.) For Q

20. = no. of protons + 10

20 - 10 = no. of protons

10 = no. of protons

atomic number = no. of protons

Atomic number = 10

3.) For R

23 = no. of protons + 12

23 - 12 = no. of protons

11 = no. of protons

atomic number = no. of protons

Atomic number = 11

4.) For S

35 = no. of protons + 18

35 - 18 = no. of protons

17 = no. of protons

atomic number = no. of protons

Atomic number = 17

Hope it will help you...