Chemistry 9th Chap 3 : Topic 18 - Maryam Publications

Chemistry Chapter 3 : Topic 18

Atomic and Ionic Symbols

1 / 18

A student writes the nuclear symbol of an element as 18 40 Ar. From this representation, which statement is correct?

A) The element has 18 neutrons and 18 electrons.

B) The element has 40 protons and 18 electrons.

C) The element has 18 neutrons and 22 protons.

D) The element has 18 protons and 22 neutrons.

2 / 18

A teacher writes the ion symbol as 12 A²⁺. What does this notation correctly represent?

A) Magnesium has lost two electrons

B) Magnesium has gained two protons

C) Magnesium has become a non-metal

D) Magnesium has gained two electrons

3 / 18

In the symbol 17 35 Cl⁻, a student interprets it as follows: “Chlorine has gained one electron.” Which part of this interpretation is correct?

A) Only mass number interpretation

B) Only atomic number interpretation

C) Charge interpretation only

D) Entire interpretation is incorrect

4 / 18

An ion is represented as 13 27 Al³⁺. What can be concluded?

A) It has 13 electrons.

B) It has 16 electrons.

C) It has 10 electrons.

D) It has 27 electrons.

5 / 18

A nuclear symbol shows 11 23 Na. Which information is NOT directly obtained from this symbol?

A) Number of neutrons

B) Chemical reactivity

C) Number of protons

D) Number of electrons in neutral atom

6 / 18

A student claims: “In 26 56 Al²⁺, iron has become more stable by gaining electrons.” What is wrong?

A) Iron does not form ions

B) Mass number is incorrect

C) Iron has gained electrons

D) Iron has actually lost electrons

7 / 18

Which interpretation of 9 19 F⁻ is correct?

A) Fluorine has become neutral

B) Fluorine has gained one electron

C) Fluorine has lost one electron

D) Fluorine has gained one proton

8 / 18

A symbol is written as 13 24 Al²⁺. Which statement is TRUE?

A) Protons =12, electrons =24

B) Protons =12, electrons =10

C) Protons =24, electrons =12

D) Protons =10, electrons =12

9 / 18

A teacher gives four representations of an element. Which one correctly shows an atom rather than an ion?

A) 8 16 O

B) 17 35 Cl⁻

C) 13 27 Al³⁺

D) 11 23 Na⁺

10 / 18

A student says: “The symbol 20 40 Ca²⁺ shows calcium has more electrons than protons.” What is correct?

A) Calcium has equal electrons and protons

B) Statement is correct

C) Calcium has fewer electrons than protons

D) Calcium has no electrons

11 / 18

Which situation correctly describes formation of 17 35 Cl⁻?

A) Chlorine loses one proton

B) Chlorine gains one proton

C) Chlorine gains one electron

D) Chlorine loses one electron

12 / 18

A symbol 10 20 Ne is given. Why does neon usually not form ions?

A) It has full outer shell

B) It has no neutrons

C) It has unstable nucleus

D) It has variable valency

13 / 18

In 33 75 As³⁻, what is the number of electrons?

A) 30

B) 36

C) 75

D) 33

14 / 18

A symbol is incorrectly interpreted as follows: “In 12 24 Mg²⁺, magnesium has gained stability by gaining electrons.” What is correct?

A) Magnesium lost 2 electrons

B) Magnesium became neutral

C) Magnesium gained 2 electrons

D) Magnesium gained protons

15 / 18

Which statement correctly explains 6 12 C ?

A) Carbon has 12 electrons and 6 neutrons

B) Carbon has 6 neutrons and 12 electrons

C) Carbon has 12 protons and 6 neutrons

D) Carbon has 6 protons and 6 electrons

16 / 18

A student sees 10 20 Ne²⁺ and says neon commonly forms this ion. What is correct?

A) Correct, because neon gains electrons

B) Incorrect, because neon has no electrons

C) Correct, because neon loses neutrons

D) Incorrect, because neon is stable and rarely forms ions

17 / 18

Which interpretation of nuclear notation is MOST accurate?

A) Atomic number gives protons

B) Mass number gives electrons

C) Charge gives number of protons

D) Atomic number gives neutrons

18 / 18

A student writes: “In 11 23 Na⁺, sodium has become more stable due to loss of one electron.” What does this imply?

A) Sodium gains electrons

B) Sodium loses protons

C) Sodium becomes neutral

D) Sodium has full outer shell after losing electron

Your score is

0%