Question

18) From the following elements, one is not naturally diatomic molecule b- Nitrogen a-Oxygen d- Copper c- lodine 19) In the element Radium Ra, the number of protons, neutrons and electrons are respectively b-88, 88, 226 a- 88, 138, 88 d- 138, 88, 88 c-88, 226, 88 20) The empirical formulas of glucose CaHi:O, is b- CHO a- CiaHaO12 d-CH O c-CH:0 21) The compound NHa is a: b-A polyatomic cation a- A monoatomic cation d-A polyatomic anion c- A monoatomic anion 22) Who is from these compounds to be molecular b-SFa a-NaCl d- KBr c-CaCl 23) Vertical columns in the periodic table called: b- Rows a- Periods d-Chalcogens c-Groups 24) The empirical formula of the compound fomed by Al" and 0 is b-AIO a- Al O d-Al,0 c- Al 0 25) All atoms of a given element have the same a-number of electrons and neutrons b- number of neutrons d-number of protons C-mass 63 26) Which combination of protons, neutrons, and electrons is correct for the isotope of copper, 29 a- 63 pt, 29 n°, 63 e -34 p+, 34 n°, 29 e b-29 pt, 29 n°, 63 e d-29 p+, 34 n°, 29 e 27) Isotopes are atoms that have the same but differing -charges, atomic masses b-atomic numbers, mass numbers - mass numbers, charges d-atomic masses, charges

Answer 1

18)

Oxygen exist as O2.

So, it is diatomic.

Nitrogen exist as N2.

So, it is diatomic.

Iodine exist as I2.

So, it is diatomic.

Copper exist as Cu.

So, it is not diatomic.

Answer: d

19)

Atomic number of Ra is 88

So,

Number of proton is 88

Number of electron is 88

Mass number of Ra = 226

So,

Number of neutron = mass number - atomic number

= 226 - 88

= 138

Answer: a

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