9/17 Quiz over Periodic table

Who is credited with creating the Periodic Table?

• Albert Einstein

• Isaac Newton

• Dmitri Mendeleev

• Marie Curie

Answer explanation

Dmitri Mendeleev is credited with creating the Periodic Table in 1869. He organized elements by increasing atomic mass and predicted the properties of undiscovered elements, establishing a systematic framework for chemistry.

What is the symbol for the element Helium?

• H

• He

• Li

• Be

Answer explanation

The symbol for Helium is 'He'. 'H' represents Hydrogen, 'Li' is Lithium, and 'Be' is Beryllium. Therefore, 'He' is the correct choice for Helium.

What is the atomic number of Carbon?

• 6

• 8

• 12

• 14

Answer explanation

The atomic number of an element is defined as the number of protons in its nucleus. Carbon has 6 protons, which gives it an atomic number of 6. Therefore, the correct answer is 6.

Which of the following elements has an atomic number of 6?

• Oxygen

• Nitrogen

• Carbon

• Hydrogen

Answer explanation

The atomic number of an element represents the number of protons in its nucleus. Carbon has an atomic number of 6, while Oxygen (8), Nitrogen (7), and Hydrogen (1) have different atomic numbers.

What is the atomic weight of Carbon as shown in the image?

• 6

• 12.01

• 14

• 8

Answer explanation

The atomic weight of Carbon is approximately 12.01, which accounts for the natural isotopic distribution of Carbon isotopes. The other options, 6, 14, and 8, do not represent the atomic weight of Carbon.

What is a key characteristic of metals in terms of electron behavior?

• Metals gain electrons

• Metals lose electrons

• Metals share electrons

• Metals do not interact with electrons

Answer explanation

A key characteristic of metals is that they lose electrons easily, which allows them to conduct electricity and form positive ions. This distinguishes them from nonmetals, which typically gain or share electrons.

Which of these elements is a halogen?

• Iron

• Nitrogen

• Bromine

• Neon

Answer explanation

Bromine is a halogen, found in Group 17 of the periodic table. Iron is a metal, nitrogen is a non-metal, and neon is a noble gas. Therefore, the correct answer is Bromine.

Which of these is an alkali metal?

• Na

• Mg

• Ga

• Ta

Answer explanation

Na, or sodium, is an alkali metal found in Group 1 of the periodic table. The other options, Mg (magnesium), Ga (gallium), and Ta (tantalum), are not alkali metals.

Which family is Calcium in?

• Alkali metals

• Alkaline earth metals

• Transition metals

• Halogens

Answer explanation

Calcium is an alkaline earth metal, which is found in Group 2 of the periodic table. This group includes elements like magnesium and barium, characterized by having two electrons in their outer shell.

How many valence electrons does Carbon have?

• 4

• 6

• 12

• 14

Answer explanation

Carbon has 4 valence electrons, which are the electrons in its outermost shell. This allows it to form four covalent bonds, making it a key element in organic chemistry.