Periodic table and the world

How does the atomic radius change as you move from left to right across a period in the periodic table?

• • Increases

• • Decreases

• • Stays the same

• • First increases, then decreases

What happens to the electronegativity of elements as you move down a group in the periodic table?

• • Increases

• • Stays the same

• • Decreases

• • First increases, then decreases

Which of the choices below, gives the order from highest to lowest for first ionization energies?

• Cl > S > Al > Ar > Si

• Ar > Cl > S > Si > Al

• Al > Si > S > Cl > Ar

• Cl > S > Al > Si > Ar

Ability of atom to attract electrons towards itself is called

• Electron affinity

• Electronegativity

• Ionization energy

• Shielding effect

Sodium is used in many household products. Why is sodium, which is explosive in water, safe to consume in the form of sodium chloride (table salt)?

• • Sodium chloride is a different chemical compound, making it chemically stable

• • Sodium is completely neutralized during the salt-making process

• • Sodium chloride has no sodium in it after processing

Why is lead a concern in cosmetics like lipstick?

• • Lead's cost is expensive

• • Lead can accumulate in the body and cause serious health issues

• • Lead is used to make products more colorful

• • Lead helps in increasing the shelf life of the product

In which of the following scenarios would understanding the element’s properties from the periodic table be crucial?

• • Designing a new computer program

• • Developing a new skincare product

• • Writing a novel

• • Planning a vacation

How can knowledge of the periodic table help us make better judgments as consumers of household products?

• • It helps us choose products with more appealing colors

• • It ensures the products are made with safe and effective ingredients

• • It increases the product's longevity

• • It allows us to understand and compare product prices