Why do elements in a group on the periodic table have similar chemical properties?

A.

same number of outermost electrons

B.

same number of protons

C.

similar atomic masses

D.

similar atomic numbers

What part of the nervous system is often called the "fight or flight" system? a. Parasympathetic c. Sympathetic b. Peripheral d. Autonomic

Which of the following metal atoms only form one type of positive change? K Cu Fe Mg

When do phase transitions occur in molecules? only when energy is withdrawn when energy is supplied or withdrawn only when energy is supplied when energy is neither supplied nor withdrawn

If an ice cube melts at 0ºC but water also freezes at 0ºC, what is the difference between melting and freezing in terms of ... 8. The energy involved in the phase changes and 9. The motion of the particles of the substances during the phase changes?

Non metal element which explodes with a pop when ignited

Describe 2 theories for yawning

When a bimetallic bar made of copper and iron strips is heated, the bar bends toward the iron strip. the reason for this is?

Where does transcription happen? why is it only in this location?

True or false during decomposition nitrogen gas is changed into nitrogen compounds

Which of the following is a suggested practice to invite families to participate in decision-making and goal-setting for their child? A. Advocacy events B. Take-home backpacks C. Family/teacher conference D. Weekly newsletters